Milk Chocolate Peanut Butter Truffle Brownies

Name: Milk Chocolate Peanut Butter Truffle Brownies
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Cuisine: American
Ingredients: 1 1/2 sticks (12 tablespoons) salted butter; 1 1/2 cups semi-sweet or milk chocolate chips; 1 cup granulated sugar; 1 tablespoon Kahlúa ((optional)); 2 teaspoons vanilla extract; 2 teaspoons instant coffee ((optional)); 3 large eggs, at room temperature; 1/3 cup all-purpose flour; 1/3 cup unsweetened cocoa powder; 3/4 teaspoon baking powder; 1/4 teaspoon kosher salt; 2 (3.2 ounce) semi-sweet chocolate bars, chopped; 1/3 cup heavy cream; 1/3 cup creamy peanut butter; 1 (3.2 ounce) milk chocolate bar, chopped