Chocolate Peanut Butter Pretzel Brownies

Ingredients

1/2 cup butter, melted

1/2 cup creamy peanut butter

1 1/4 cups granulated sugar

2 large eggs

1 teaspoon vanilla extract

3/4 cup all-purpose flour

1/2 teaspoon baking powder

1/4 teaspoon salt

3/4 cup semi sweet chocolate chips

3 tablespoons cocoa powder

3 tablespoons crushed pretzels