the best we've ever had.
Preheat oven to 400.
Combine flour, sugar, salt & baking powder.
Place oil into a 1 cup measure; add egg & enough milk to fill cup.
Combine with flour mix.
Mix topping ingredients & sprinkle over muffins.
Bake 20 – 25 mins.
Topping:
1/2 cup sugar
1/3 cup flour
1/4 cup butter
1 1/2 tsp cinnamon