Instructions

1. 1
   Combine brown sugar, flour, and cinnamon in a mixing bowl.
2. 2
   Cut in until mixture resembles coarse crumbs. Set aside.
3. 3
   Combine softened margarine/butter, flour, cinnamon, sugar, and baking powder in a mixing bowl. Make a well in the center.
4. 4
   Beat egg, milk, and oil in a small bowl. Stir in apple. Pour into well. Stir until just moistened.
5. 5
   Fill standard muffin cups ¾ full with batter. Sprinkle streusel topping over the batter.
6. 6
   Bake at 400 °F (200 °C) for 15 to 20 minutes or until golden.