Heat oven to 375 degrees F. Spray a 12 cup muffin pan with non-stick cooking spray.
In a large bowl, mix flour, baking powder, cinnamon, salt, and cloves.
In a medium bowl whisk egg, sugar, oil, and vanilla. Add applesauce.
Make a well in the center of the dry ingredients. Pour egg mixture into well and stir just until dry ingredients are moistened. Fold in diced apples. Divide batter among muffin cups, about 1/3 cup each.
In a small bowl mix butter, nuts, brown sugar and flour until crumbly. Sprinkle over tops of muffins.
Bake in 375 degree F oven for 22 to 25 minutes or until toothpick inserted in center comes out clean. Cool in pan 5 minutes and then remove muffins to a wire rack to cool completely.