Fudgy Mocha Toffee Brownies

Cooking spray
2 tablespoons instant coffee granules
1/4 cup hot water
1/4 cup butter
1/4 cup semisweet chocolate chips
1 1/2 cups all-purpose flour (about 6 3/4 ounces)
1 1/3 cups sugar
1/2 cup unsweetened cocoa
1 teaspoon baking powder
1/2 teaspoon salt
1 teaspoon vanilla extract
2 large eggs
1/4 cup toffee chips

Preheat oven to 350°. Coat bottom of a 9-inch square baking pan with cooking spray. Combine coffee granules and 1/4 cup hot water, stirring until the coffee granules dissolve. Combine butter and semisweet chocolate chips in a small microwave-safe bowl. Microwave at HIGH for 1 minute or until butter melts; stir until chocolate is smooth. Lightly spoon flour into dry measuring cups; level with a knife. Combine flour, sugar, unsweetened cocoa, baking powder, and salt in a large bowl, stirring with a whisk. Combine coffee mixture, butter mixture, vanilla extract, and eggs in a medium bowl, stirring with a whisk. Add coffee mixture to flour mixture; stir just until combined. Spread evenly into prepared pan. Sprinkle evenly with toffee chips. Bake at 350° for 22 minutes. Cool on a wire rack