The Best Cocoa Fudge Brownies

Name: The Best Cocoa Fudge Brownies
Prep time: 10 min
Cook time: 28 min
Total time: 38 min
Cuisine: American
Ingredients: 1 cup (120g) all-purpose flour; 1/2 teaspoon baking powder; 1/2 teaspoon salt; 1/2 cup (43g) unsweetened cocoa powder; 1 teaspoon espresso powder (optional (don't use if you don't like coffee)); 3/4 cup (170g) unsalted butter; 2 Tablespoons (28ml) oil (canola, vegetable, or coconut will work); 1 and 1/3 cups (265g) granulated sugar (divided ); 2 large large eggs; 1 large egg yolk; 2 teaspoons vanilla extract (optional, but recommended ); 3/4 cup (128 grams) chocolate chips