Homemade Brownie Recipe

Name: Homemade Brownie Recipe
Prep time: 10 min
Cook time: 25 min
Total time: 35 min
Cuisine: American
Ingredients: 1 cup unsalted butter, (melted and cooled); 2 tablespoons vegetable oil; 1¼ cups granulated sugar; 1 cup packed light brown sugar; 4 eggs, (room temperature); 1 tablespoon vanilla extract; 1 cup all-purpose flour; 1 cup unsweetened cocoa powder; ¾ teaspoon salt; ½ teaspoon baking powder; 1 cup chocolate chips, (milk or semisweet, divided); sprinkles, toffee bits, crushed Oreos, crushed candies, chopped nuts (optional)