Cheddar-Parmesan Cheese Bread

2 cups all-purpose flour
1 Tab. sugar
1 Tab. baking powder
1/2 tea. salt
1 tea. dry mustard
1/4 cup butter
1 cup shredded cheddar cheese
2 Tab. parmesan cheese
1 cup milk
1 egg
1/2 cup finely chopped onions
1 tsp Paprika

Preheat oven to 350F. Grease a 9 x 5 baking pan. Combine flour, sugar, baking powder, salt and mustard. Using a pastry blender, cut in butter until the mixture resembles coarse meal. Stir in the Parmesan and 1/2 cup of the cheddar cheese. Beat milk and egg until well blended. Add to flour mixture and mix with a fork until dry ingredients are moistened. Spoon batter into greased pan. Toss remaining ½ cup cheddar cheese with onion and paprika. Sprinkle on top of batter. Bake for 60 minutes. Cool in pan on a wire rack for 10 minutes before removing from pan.