Heat oven to 400° (200° c) degrees, prepare muffin tins (I made 9 muffins and I filled the tins to the top),
To make the topping, in a small bowl combine sugar and flour cut in butter and mix until mixture resembles large crumbs then stir in the chips, set aside.
In large bowl using a whisk, whisk together for about 30 seconds flour, baking soda,baking powder and salt, then add mini chocolate chips, stirring gently to combine.
In a medium bowl beat together on medium speed for about 1 minute, egg, sugar, melted butter and milk.
Fold the egg mixture into the dry ingredients just until combined (about 15 stirs no more).
Spoon the batter (batter will be thick) into prepared muffin tins (I lined my tins with cupcake liners). Sprinkle with topping. Bake approximately 15-20 minutes, check for doneness with a toothpick. Let cool and enjoy!