Pre heat oven to 350°F

Cook green beans according to package directions then drain

Cook bacon in a large skillet untill crisp

Remove bacon drain and set aside and save drippings

Saute onion in bacon drippings untill tender remove onion and set aside

Add flour and sugar to bacon drippings cook for 1 minute stirring well

Add milk, salt and pepper and cook stirring constantly until thickened

Stir in mayo, green beans, bacon, and onions

Spoon into a lightly greased 1 1/2 quart casserole dish

Sprinkle with cheese, fried onions, and cracker crumbs

Bake at 350 degreese for 20 minutes