- Line an 8-by-8-inch pan with parchment paper; set aside.
- In a microwave-safe bowl, melt peanut butter in microwave for about 25 seconds.
- Spread an even layer in pan.
- Freeze for 1 hour.
- Remove peanut butter sheet from pan and return to freezer to keep frozen.
- Heat oven to 350°F.
- Line an 8-by-8-inch pan with parchment paper.
- In a microwave-safe bowl, combine butter and chocolate.
- Melt mixture in microwave in 30-second bursts, stirring between bursts, until smooth.
- Whisk in sugar until combined; cool.
- Add in eggs, yolk, and vanilla; whisk until well combined.
- Stir in flour, cocoa powder, and salt.
- Pour half of batter into prepared pan.
- Place peanut butter sheet over batter.
- Pour remaining batter over, covering completely.
- Bake for 30 minutes, or until cooked through but slightly soft in center.
- Cool for 30 minutes.
- Remove from pan and cool for another 30 minutes before serving.
- Store in an airtight container at room temperature for up to 3 days or in the refrigerator for up to 5 days.
Serves 9.
Approximate Nutrient Analysis per serving:
360 calories, 22 g fat, 12 g saturated fat, 95 mg cholesterol, 115 mg sodium, 39 g carbohydrate, 1 g fiber, 30 g sugar, 5 g protein