1Preheat oven to 350 f. Grease an 6 texas size muffin pan or an regular 12 muffin pan.
Cut apples into chunks, set aside.
In a medium bowl, mix flour, baking powder, baking soda and salt, set aside
2In a large bowl, cream together butter and sugar. Beat in eggs one at a time. Mix in vanilla. Stir in apples and then gradually stir in four.
Fold in the cinnamon chips.
Spoon the mixture into the prepared muffin pan.
3In a small bowl combine brown sugar, flour and cinnamon. Cut in butter until the mixture is like coarse crumbs. Sprinkle over tops of muffin mixture.
4Bake 30-35 minutes for texas size and 25 for regular size muffins or until a toothpick inserted comes out clean. Allow to sit for 5 minutes before removing muffins from the pan. Cool on wire rack.