Easy Cauliflower Casserole

Ingredients

• 1 large head cauliflower, broken into flowerets
• 1/2 c. mayonnaise
• 1/2 c. shredded Cheddar cheese
• 1/2 tsp. dry mustard
• 1/4 tsp. salt
• 1/8 tsp. red pepper
• 3 strips bacon, cut up
• 1 medium size onion
• 2 c. or more coarsely cut up cabbage
• 2 c. leftover potatoes