Preheat oven to 400° F. Line twelve medium muffin cups with paper baking cups.
Combine flour, oats, sugar, nuts, if desired, baking powder, pumpkin pie spice, baking soda and salt in large bowl; mix well. Combine pumpkin, milk, oil and egg in medium bowl; blend well. Add to dry ingredients all at once; stir just until dry ingredients are moistened. (Do not overmix.)
For streusel mix all ingredients in small bowl; mix well.
Fill muffin cups almost full. Sprinkle with reserved streusel, patting gently.
Bake for 22 to 25 minutes or until golden brown. Cool in pan on wire rack for 5 minutes. Remove from pan. Serve warm.Gluten Free
Use gluten free oats and gluten free flour mixDairy Free use dairy free milk and dairy free margarine.