Place ingredients in a large bowl and use your fingers to cut the butter into the rest of the ingredients until a cohesive blend is formed.
Preheat oven to 350F and line 2-12 cavities muffins tins with muffins liners (total 15 liners)
In a medium bowl place the cubed apple. Sprinkle the cinnamon and 1 TBS sugar and toss to evenly incorporate. Set aside.
In a large bowl, place the flour, sugar, and baking powder and use a fork to blend.
In a separate bowl, mix together the apple sauce, eggs and oil then pour it over the flour mix. Use a fork or a whisker to blend.
Fold in the apples.
Divide the batter between the muffins liners, each 3/4 full then sprinkle about 1 TBS of the crumbs on top.
Bake for 18-22 minutes or just until a toothpick comes out clean from the center of the muffins.