Rich Sweet Potato Bake with Smoked Gouda and Rosemary - Yummy Gusto

Ingredients

• 3 pounds of sweet potatoes, peeled and cut into thin ⅛-inch slices
• ½ tablespoon of chopped fresh rosemary leaves
• 2 medium red onions, sliced thinly
• 8 ounces of grated asiago cheese
• 8 ounces of grated smoked gouda cheese
• ¼ teaspoon of fresh black pepper, ground
• 1 teaspoon of smoked paprika
• ¼ teaspoon of ground sage
• ¼ teaspoon of salt
• 2 teaspoons garlic powder
• 4 tablespoons of melted butter
• ½ cup heavy cream
• 2 cups of milk
• 1 cup sour cream
• ¼ cup of cornstarch