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Export 6 ingredients for grocery delivery
Step 1
Preheat oven to 350º F. Lightly spray a 9x13-inch pan with cooking spray. Spread potatoes in prepared pan. Set aside.
Step 2
In a large saucepan, combine milk, heavy cream, dry mustard, salt, garlic powder and black pepper. Add cheese and cook over medium-low heat until cheese melts.
Step 3
Pour cheese mixture over potatoes.
Step 4
Bake, uncovered, for 1 hour.