Line a 9x13-inch baking dish with aluminum foil or parchment paper. Leave some excess hanging over to make removal easy. For best results, spray foil with nonstick spray.
In a large pot over medium heat, melt the butter. Stir in the peanut butter and vanilla until smooth and combined.
Add the marshmallows and stir frequently until completely melted. Remove from the heat.
Fold in the Rice Krispies cereal until well coated.
Scoop the mixture into the prepared pan and press it down gently into an even layer. Let cool at room temperature until set, about 20 minutes.
Once cooled, lift the mixture out of the pan using the foil and transfer to a cutting board.
Melt the chocolate in a microwave-safe bowl in 30-second intervals, stirring between each until smooth.
Drizzle melted chocolate over the top, then sprinkle the halved mini Reese’s and crushed pretzels.
Let the chocolate set completely before cutting into squares or bars.
Notes
To prevent sticking, spray a spatula with a bit of cooking spray before pressing the mixture into the pan.
Use dark chocolate or add flaky sea salt on top for a little extra flavor if desired.
Keyword Rice Krispies with Peanut Butter and Chocolate topped with Pretzels and mini Reese's