Put 2 1/2 tablespoons butter in a saucepan and melt over medium-low heat.
Add 4 teaspoons all-purpose flour, 1/4 teaspoon dry mustard, 1/2 teaspoon Worcestershire sauce and 1/8 teaspoon pepper and stir well.
Slowly stir in 2 cups milkand cook on medium until it comes to a boil, stirring frequently so the milk on the bottom does not scald.
While your milk is heating, wash and slice 4 cups Russet Potatoes and dice 1/4 cup onion (don't forget to stir your milk mixture) and combine the potato slices and diced onion in a lightly greased 2.5 Small Casserole Crock Pot, 2.5 Quart Crock Pot, 3 Quart Crock Pot OR 4 Quart Crock Pot.
Once the milk mixture reaches a boil, reduce your heat back to medium-low.
Cook your milk mixture, while stirring it frequently, until it thickens a little and is bubbly. (It took mine about 5-7 minutes.)
Add 1 1/3 cups shredded Cheddar cheese to the milk mixture and stir until the cheese is melted.
Pour your cheese mixture over your potatoes and give them a good stir.
Cover and cook on low for 5-6 hours or on high for 2 1/2- 3 hours, stirring halfway through the cooking time. (It is done when your potatoes are tender.)
In a small microwave safe bowl, melt your remaining 1 tablespoon butter and combine with 1/3 cup traditional bread crumbs and sprinkle evenly over your potatoes.
Cook on high, uncovered for an additional 30 minutes.
Notes
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As with any of our recipes, carb counts, calorie counts and nutritional information varies greatly. As a result, your nutritional content depends on which products you choose to use when cooking this dish. The auto-calculation is just an automated estimate and should NOT be used for specific dietary needs.
All slow cookers cook differently, so cooking times are always a basic guideline. Recipes should always be tested first in your own slow cooker and time adjusted as needed.