Step 1

Preheat broiler. Cook hash browns in large skillet according to package directions.

Step 2

Meanwhile, melt butter in large ovenproof, high-sided skillet set over medium heat. Sprinkle flour over top; cook for 2 to 3 minutes or until smooth. Slowly whisk in milk. Stir in Roasted Garlic Base; bring to simmer, whisking constantly. Cook, stirring occasionally, for 3 to 5 minutes or until thickened.

Step 3

Stir in sour cream; cook for 1 to 2 minutes or until heated through.

Step 4

Stir in 1 cup mozzarella and 1/2 cup Parmesan until melted. Fold in cooked hash browns and green onions. Cook for 2 to 3 minutes or until sauce is thickened and potatoes are well coated.

Step 5

Sprinkle with remaining mozzarella and Parmesan; broil for 2 to 3 minutes or until top is golden brown.