In a large bowl add flour, baking soda, baking powder, cocoa and salt. Using a whisk mix these dry ingredients well.

In another bowl beat butter and sugar until creamy. Add eggs and vanilla and mix again.

Add butter mixture to flour mixture. Mix for about 2 minutes to make sure your batter is well combined.

Spoon mixture in muffin cups only 2/3 full. Bake at 350° for 15-17, until toothpick inserted in middle of cupcake comes out clean.