Preheat the oven to 350°F (175°C).
Grease and line a 9×13-inch baking pan with parchment paper.
2. Mix Dry Ingredients
In a medium bowl, whisk together flour, cocoa powder, baking powder, and salt.
3. Combine Wet Ingredients
Warm the milk slightly if needed. Beat it with any remaining wet ingredients (e.g., butter, sugar, eggs – provide if available) until smooth.
4. Make the Batter
