Oh my goodness, let me tell you about my Mile High Peanut Butter Mousse Brownie Pie – it’s the dessert that makes everyone at my dinner parties go absolutely wild! Picture this: a flaky crust, fudgy brownie layer studded with peanut butter cups, and this dreamy cloud of peanut butter mousse piled high on top. The best part? It’s shockingly easy to make, especially when you let a trusty boxed brownie mix do half the work for you.
I first made this pie for my husband’s birthday years ago, and now he requests it every single year. The combination of rich chocolate and creamy peanut butter is just magical – like a peanut butter cup got all dressed up for a fancy party. And that mousse topping? It’s so light yet decadent, you’ll want to eat it with a spoon straight from the bowl (not that I’ve ever done that… okay, maybe once or twice).
Why You’ll Love This Mile High Peanut Butter Mousse Brownie Pie
Trust me, this pie is about to become your new go-to dessert for every occasion. Here’s why:
- Rich, dreamy layers: That perfect combo of fudgy brownie and fluffy peanut butter mousse will have everyone begging for seconds
- Easy assembly: With a store-bought crust and boxed brownie mix, you’re halfway done before you even break a sweat
- Crowd-pleaser: Chocolate + peanut butter = instant happiness. I’ve never met anyone who could resist a slice
- Make-ahead magic: The chilling time means you can prep it in the morning and impress guests that night
- Customizable: Toss in extra peanut butter cups or drizzle with chocolate – make it your own!
Seriously, this pie disappears faster than I can make it. You’ve been warned!
Ingredients for Mile High Peanut Butter Mousse Brownie Pie
Okay, let’s gather our goodies! Here’s everything you’ll need to create this peanut butter-chocolate masterpiece. I’ve learned through trial and error that quality ingredients make all the difference here – especially when it comes to that peanut butter mousse layer.
- 1 refrigerated pie crust (the kind you unroll – trust me, no shame in this shortcut!)
- 1 box (18-20 oz) favorite brownie mix plus whatever ingredients it calls for (usually eggs, oil, and water)
- 8 regular-sized peanut butter cups, roughly chopped (Reese’s work perfectly)
- 4 oz cream cheese, at room temperature (this is KEY for smooth mousse)
- 1 cup creamy peanut butter (I swear by Jif or Skippy for this – natural PB can separate)
- 1/2 cup powdered sugar, sifted (no lumps allowed in our mousse!)
- 1/2 tsp vanilla extract (the good stuff makes a difference)
- 1/4 tsp salt (balances all that sweetness)
- 1 cup heavy whipping cream, very cold (this is what gives us those dreamy peaks)
- Extra chopped peanut butter cups for garnish (because more is always better)
Pro tip: Set your cream cheese and peanut butter out about 30 minutes before starting – room temp ingredients blend so much smoother!
Equipment You’ll Need
Don’t worry – you probably already have most of this stuff in your kitchen! Here’s what you’ll need to whip up this pie:
- 9-inch glass pie plate (metal works too, but glass lets you see the crust browning)
- Hand mixer or stand mixer (for that dreamy mousse)
- Mixing bowls (a couple different sizes)
- Measuring cups and spoons
- Spatula (for scraping every last bit of that peanut butter goodness)
- Aluminum foil (to protect the crust edges)
That’s it! Now let’s get baking.
How to Make Mile High Peanut Butter Mousse Brownie Pie
Okay, let’s make some magic happen! This pie comes together in four simple steps – I promise it’s easier than it looks. Just follow along and you’ll have the most impressive dessert ready in no time.
Step 1: Prepare the Crust and Brownie Layer
First things first – preheat that oven to 350°F (175°C). Now take your refrigerated pie crust and gently unroll it into your 9-inch pie plate. Press it in nice and snug, then flute the edges however you like – I just use my fingers to make little waves all around. Easy peasy!
Next, whip up your brownie mix according to the package directions (this is where those eggs, oil, and water come in). Here’s my secret – once the batter’s mixed, fold in those chopped peanut butter cups! Just gently stir until they’re evenly distributed. Pour this glorious mixture right into your waiting pie crust. The crust won’t be pre-baked – we’re doing it all in one go, which saves so much time.
Step 2: Bake and Cool the Brownie Layer
Pop that beauty in the oven for 30-40 minutes. Here’s a crucial tip: after about 15-20 minutes, when the crust edges start looking golden, loosely cover them with strips of aluminum foil. This prevents burning while the brownie finishes baking. The pie is done when a toothpick inserted near the center comes out with moist crumbs (not wet batter).
Now for the hard part – patience! Let the pie cool on a wire rack for about 20 minutes, then transfer it to the fridge for at least 1 hour. I know it’s tempting, but don’t skip this step – a cooled base means your mousse won’t melt when you add it!
Step 3: Make the Peanut Butter Mousse
While the pie chills, let’s make that heavenly mousse. In a large bowl, beat the room-temperature cream cheese and peanut butter together until perfectly smooth and fluffy – about 2 minutes. Then add the powdered sugar, vanilla, and salt, beating until everything’s combined and dreamy.
In another bowl, whip that cold heavy cream to stiff peaks (this takes about 3-4 minutes with a mixer). Now here’s the fun part – gently fold the whipped cream into the peanut butter mixture. I do this in three additions, using big, sweeping motions to keep all that air in there. The result should be light, fluffy, and absolutely irresistible!
Step 4: Assemble and Chill the Pie
Time to put it all together! Spoon that gorgeous mousse onto your cooled brownie layer and spread it evenly with a spatula. Don’t be shy – pile it high! Then sprinkle those extra chopped peanut butter cups over the top for that perfect finishing touch.
Now comes the final test of willpower – refrigerate the pie for at least 3 hours, though overnight is even better. This sets everything perfectly so you get clean slices. Trust me, it’s worth the wait. When you’re ready to serve, run a knife under hot water and dry it before slicing for picture-perfect pieces every time!
Tips for the Perfect Mile High Peanut Butter Mousse Brownie Pie
After making this pie more times than I can count, I’ve picked up some foolproof tricks for perfection:
- Room temp is key: That cream cheese and peanut butter MUST be softened – cold ingredients make lumpy mousse
- Chill your bowl: Pop your mixing bowl in the freezer for 10 minutes before whipping the cream – it’ll hold peaks better
- Don’t rush the chill: That 3-hour minimum sets everything properly – slice too soon and you’ll have a delicious mess
- Hot knife trick: For clean slices, dip your knife in hot water and wipe dry between cuts
- Extra garnish: Right before serving, drizzle with melted chocolate or caramel for extra wow factor
Follow these and your pie will be the star of any gathering!
Variations and Substitutions
Want to mix things up? This pie is super flexible! Try these easy swaps:
- Homemade crust: If you’re feeling fancy, use your favorite pie dough recipe instead of store-bought
- Nut butter twist: Swap peanut butter for almond or cashew butter – just stick with creamy varieties
- Brownie upgrade: Use your favorite homemade brownie recipe if you’ve got a killer one
- Candy mix-ins: Try chopped Snickers or Butterfingers instead of peanut butter cups
- Chocolate crust: Add cocoa powder to the pie dough for extra chocolate goodness
The possibilities are endless – make it your own!
Serving and Storage
Here’s the deal – this pie MUST stay refrigerated until serving! The mousse holds its shape best when cold. Slice with a hot knife (trust me on this trick) for picture-perfect wedges. Leftovers? Just cover tightly with plastic wrap and they’ll keep happily in the fridge for 3-4 days – if they last that long!
Nutritional Information
Just so you know, nutrition varies based on brands used. But here’s an estimate per slice: about 520 calories, 32g fat, 48g carbs, and 10g protein. A little goes a long way with this rich dessert!
Frequently Asked Questions
I get asked about this Mile High Peanut Butter Mousse Brownie Pie all the time! Here are the most common questions – with all my hard-earned answers:
Can I freeze this pie?
Absolutely! Wrap it tightly in plastic wrap, then foil, and freeze for up to 1 month. Thaw overnight in the fridge before serving. The texture might be slightly denser, but still delicious!
How do I prevent a soggy crust?
Two tricks: First, make sure your brownie layer bakes fully (no wet spots). Second, let the pie cool completely before adding the mousse. That hour in the fridge makes all the difference!
Can I use natural peanut butter?
I don’t recommend it – natural PB tends to separate and can make your mousse grainy. Stick with regular creamy peanut butter for that perfect silky texture.
How far in advance can I make this?
It’s actually better the next day! Assemble it 1-2 days ahead – the flavors meld beautifully. Just add the final peanut butter cup garnish right before serving.
What if my mousse won’t hold peaks?
Make sure your cream is ice-cold and your bowl is chilled. If it’s humid, add 1 tbsp powdered sugar while whipping – this helps stabilize the cream.
Irresistible Mile High Peanut Butter Mousse Brownie Pie Recipe
- Total Time: 5 hours (including chilling)
- Yield: 8-10 slices 1x
- Diet: Vegetarian
Description
A decadent peanut butter mousse brownie pie with a flaky crust, rich brownie layer, and creamy peanut butter mousse topping.
Ingredients
- 1 refrigerated pie crust
- Favorite boxed brownie mix, plus ingredients called for on the box
- 8 peanut butter cups, chopped
- 1/2 block (4 oz.) cream cheese, at room temperature
- 1 cup creamy peanut butter
- 1/2 cup powdered sugar, sifted
- 1/2 tsp vanilla extract
- 1/4 tsp salt
- 1 cup heavy whipping cream
- More chopped peanut butter cups, for garnish
Instructions
- Preheat oven to 350°F (175°C). Fit pie crust into 9-inch glass pie plate and flute edges.
- Prepare brownie mix per package instructions. Fold in chopped peanut butter cups. Pour into pie crust.
- Bake 30-40 minutes, covering crust edges with foil after 15-20 minutes. Cool 20 minutes then refrigerate 1 hour.
- Beat cream cheese and peanut butter until fluffy. Add powdered sugar, vanilla, and salt. Beat until smooth.
- Whip heavy cream to stiff peaks. Fold into peanut butter mixture.
- Spread mousse over cooled brownie layer. Top with more chopped peanut butter cups. Refrigerate 3+ hours.
Notes
- Use room temperature cream cheese for smoother mousse
- Chill pie thoroughly before serving for clean slices
- Store leftovers refrigerated
- Prep Time: 20 minutes
- Cook Time: 30-40 minutes
- Category: Dessert
- Method: Baked
- Cuisine: American
Nutrition
- Serving Size: 1 slice
- Calories: 520
- Sugar: 38g
- Sodium: 320mg
- Fat: 32g
- Saturated Fat: 12g
- Unsaturated Fat: 16g
- Trans Fat: 0g
- Carbohydrates: 48g
- Fiber: 3g
- Protein: 10g
- Cholesterol: 45mg