Salted Peanut Fudge Brownies With Peanut Butter Frosting

Ingredients

• 1 cup unsalted butter
• 1 + 1/4 cups semisweet chocolate chips
• 3 ounces unsweetened chocolate, chopped
• 1 cup plus 2 tablespoons sugar
• 3 eggs
• 1 1/2 tablespoons instant coffee granules, optional
• 2 teaspoons vanilla extract
• 1/2 teaspoon cinnamon
• 2/3 cup all purpose flour
• 1 + 1/2 teaspoons baking powder
• 1/2 teaspoon salt
• 1 + 1/3 cups peanut butter chips or semi-sweet chocolate chips
• 2/3 cup salted peanuts, chopped, plus more for top