Mennonite Orange Muffins

Combine flour, baking powder, baking soda, salt, white sugar and grated orange peel. Stir in orange juice, 1/2 cup melted butter, eggs and chopped nuts. Pour into 12 muffin cups. Blend 1 tablespoon melted margarine, 1/4 cup brown sugar, 1/2 teaspoon cinnamon and sprinkle on top of each muffin. Bake in a preheated 350 degrees F (175 degrees C) oven for 20-25 minutes. Serve hot.