Add wet ingredients to the dry ingredients and stir well to combine, but do not overmix.
Stir in the apples and cinnamon.
Divide the batter into the muffin tins about 2/3 full. (Batter will be thicker batter - see note.)
Bake at 400*F for 15-20 minutes or until a toothpick inserted comes out clean.
Serve warm or room temperature.
Store leftovers in an airtight container.
This batter does not pour. It is not like cake batter, it will be a spreadable batter. It can be scooped out then spread in the muffin tin. It is important not to overmix. If yours is too thick, add milk a tablespoon at a time but remember it is meant to be a thick batter.