These ultimate chocolate peanut butter brownie bars start with a fudgy brownie base, then stack on gooey marshmallow, creamy peanut‑butter topping, and a glossy chocolate layer loaded with candy pieces or soft caramels. Every bite hits dark chocolate, sweet marshmallow, and salty peanut butter, making them perfect for parties, bake sales, or whenever you want a dessert that looks as outrageous as it tastes.
Ingredients
Brownie layer
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1 box fudgy brownie mix (for a 9×13‑inch pan) + ingredients listed on the box
or your favorite homemade brownie batter for the same size pan
Marshmallow layer
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3 cups mini marshmallows
Peanut‑butter layer
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1 cup creamy peanut butter
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1/4 cup unsalted butter
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1 1/4 cups powdered sugar
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1 teaspoon vanilla extract
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Pinch of salt
Chocolate topping
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2 cups semi‑sweet chocolate chips
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3/4 cup heavy cream (or 1/2 cup cream + 1/4 cup peanut butter for extra flavor)
Candy garnish
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1–1 1/2 cups chopped soft caramels, peanut‑butter candies, or mini peanut‑butter cups
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Optional: extra chocolate chips for sprinkling
Instructions
1. Bake the Brownie Base
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Heat oven to 350°F (175°C). Line a 9×13‑inch pan with parchment and lightly grease.
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Prepare brownie batter according to package or recipe directions.
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Spread batter in the pan and bake until a toothpick inserted near the center comes out with moist crumbs, not wet batter (usually 20–25 minutes for boxed mix).
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Remove from oven but leave oven on.
