3-4 lbs. red potatoes
1 1/2 c. mayonnaise
1 1/2 c. Velveeta (cubed)
1 med. onion
1/2 tsp. salt
1/4 tsp. pepper

Cube unpeeled potatoes in large bowl. Combine all ingredients including mayonnaise. Place in greased 9x13 inch pan or casserole. Bake at 350 degrees 1 1/2 hours. Don't prepare more than 2 hours ahead.