My cheese sauce recipe for 8 oz pasta:
3 cups shredded cheese (typically 2 cups cheddar and 1 cup Gouda)
2 cups whole milk
8 oz velveeta
2 TBS butter
2 TBS flour
1 tsp yellow mustard (optional)
Salt and pepper to taste
On medium to low heat, melt butter. Add flour and cook till bubbly. Add milk slowly to avoid lumps in roux. Add velveeta until melted. Add cheese until melted. Add salt and pepper til taste.
Mix cheese and slightly undercooked pasta. Then put into greased baking dish and bake at 350 degrees Fahrenheit for 25 minutes. I like to add panko bread crumbs mixed with melted butter for a topping.