Preheat oven to 350 F. Place paper muffin cups inside muffin tin. Spray muffin cups with non-stick cooking spray.
Make streusel topping - combine butter and sugars with electric mixer. Slowly stir in flour and cinnamon until topping resembles small crumbs. Set aside.
For the muffin batter, mix all dry ingredients together well. Then, mix all wet ingredients well (applesauce, eggs and pumpkin).
Slowly add wet ingredients to dry ingredients. Stir by hand until combined. Do not over mix (could result in spongy muffins).
Fill muffin cups ¾ full. Sprinkle 2-3 teaspoons of streusel topping on top of every muffin.
Bake at 350F for 15-17 minutes or until toothpick inserted in center comes out clean.