Fabulous Cheese Fondue (crock pot)

1 Tbsp margarine
1/4 cup onion, chopped
2 cloves garlic, minced
1 Tbsp all-purpose flour
1/2 cup dry white wine
1/4 cup reduced-fat milk
8-oz Cheddar cheese, shredded
8-oz Gruyère cheese
2-oz Blue cheese, crumbled
1/2 tsp red pepper flakes
4 to 6 drops hot pepper sauce

Combine all ingredients in the stoneware. Cover cook on Low 2 to 2 1/2 hours, stirring once or twice, until cheese is melted and smooth.

Source: The Rival Company