Ingredients

• 1 cup water
• 2.33 cups all-purpose flour , divided
• 0.5 cups unsalted butter
• 0.67 cups unsweetened cocoa powder
• 2 cups white sugar
• 1 teaspoon vanilla extract
• 2.5 teaspoons baking powder
• 0.5 teaspoons salt
• 0.5 cups chopped walnuts , Optional

Instructions

1. 1 Gather all ingredients.
2. 2 Preheat the oven to 350 degrees F (175 degrees C). Grease a 9x13-inch pan.
3. 3 Combine water and 1/3 cup flour in a heavy saucepan over medium heat; cook, whisking constantly, until thick. Transfer mixture to a large mixing bowl and set aside to cool, 15 to 20 minutes.
4. 4 Melt butter in a small saucepan over medium heat. Mix in cocoa until smooth; remove from the heat and let cool, about 15 minutes.
5. 5 Combine remaining 2 cups flour, baking powder, and salt in a small bowl, set aside. Add sugar and vanilla to cooled flour-water mixture; mix with an electric mixer until well combined.
6. 6 Add cocoa mixture and mix until incorporated. Add dry flour mixture and stir until just blended; fold in walnuts.
7. 7 Spread evenly in the prepared pan.
8. 8 Bake in the preheated oven until a toothpick inserted into the center comes out clean, 20 to 25 minutes. Cool before cutting into 20 squares.

Nutrition per serving