Ham and Potato Casserole

3 potatoes, peeled, diced, and cooked

1/4 c. chopped green pepper

1 T. flour

1 c. milk

1 c. grated cheddar cheese

2 T. margarine

1/4 c. chopped onion

dash of pepper and salt

1/4 c. mayo

1 c. leftover ham

Saute onion and green pepper in margarine. Blend in flour, salt, & pepper. Add milk, mayo, and cheese. Stir to blend. Layer potatoes and ham in sprayed casserole ish. Pour sauce over potatoes. Bake at 350 until hot and bubbly, about 20-30 minutes.