Preheat the oven to 325°. Spray 2 mini muffin pans with vegetable oil spray. In a bowl, whisk the baking flour, sugar, cocoa powder, baking powder, baking soda, salt and xanthan gum. In another bowl, whisk the applesauce, oil and vanilla; stir into the dry ingredients. Stir in the chocolate chips. Spoon the batter into the muffin pans, filling them three-quarters full. Bake for 15 minutes, or until set. Let the brownies cool in the pans for 15 minutes, then turn out onto a rack to cool completely.