Pre-heat oven to 350 degrees. Line two cookie sheets with parchment paper (or grease them).
In a microwave safe bowl, melt butter and peanut butter together.
Stir in brown sugar, granulated sugar, baking soda, baking powder, and vanilla.
Add in flour 1/2 cup at a time. It is always possible you will need slightly less flour than the recipe calls for. Your dough should be thick but not dry.
Fold in mini chocolate chips.
Scoop cookie dough by the tablespoonful onto cookie sheet. Bake for about 10 minutes.
Allow to cool and enjoy. Preferably with a tall glass of milk.