Broccoli,Potato, Cheese soup

Thank you Ruth Shank!
Broccoli,Potato, Cheese soup 
2 cups of diced potatoes
3 tbsp chopped onions
10 oz pkg frozen broccoli cuts
2 tbsp butter ,melted
1 tbsp flour 
1 cup cubed Velveeta light cheese 
1/2 tsp salt 
1/4 tsp black pepper 
5 1/2 cups fat free milk

Cook potatoes and onions in boiling water in saucepan until potatoes are crisp & tender. Drain. Place in Crock pot and add all the remaining ingredients. Stir together. Cover and Cook on low 4 hours. (230 calories )
If you want at thicker soup and your diet allows it add 3 tbsp of flour