Blend in flour. Cook, stirring constantly, for 1 minute. Add mustard after flour, if using
Gradually add milk; cook, stirring constantly. As milk is starting to thicken, add cottage cheese
Continue cooking and stirring until thickened
Add all the rest of the cheeses, stirring until melted
Put macaroni in slow cooker and pour cheese mix in; mix well
Cook on low heat for 6 to 8 hours
Baked directions: Reserve about 1/2 to 3/4 cup of a mix of all the cheeses, except cottage cheese. Put macaroni in large bowl (3-1/2 qt), pour cheese sauce in; mix well Pour into 2-1/2 qt greased casserole Sprinkle reserved cheese on top Bake at 375° for 20 to 25 minutes. Let stand 5 minutes before eating
