chocolate shortcrust pastry

Name: chocolate shortcrust pastry
Prep time: 15 min
Cook time: 40 min
Total time: 55 min
Yield: 6 servings
Ingredients: 5 gr of Baking powder; 30 gr of Cocoa powder; 1 Medium egg; 250 gr of Plain flour; 120 gr of Unsalted butter; 100 gr of White sugar