Sweet Potato Gruyere Gratin - Slow Cookers | BLACK + DECKER

Ingredients

• 4 Tbsp. butter for sauce, butter for coating slow cooker
• 4 Tbsp. flour
• 4 cloves garlic, chopped
• 3 cups shredded Gruyere (other cheese can be substituted, such as fontina, Cheddar or aged gouda)
• 1 leek
• 3 cups whole milk
• 1 tsp. black pepper, more to taste
• 4-6 russet potatoes
• 1 tsp. dried sage
• 1 tsp. salt, more to taste
• Salt and pepper for seasoning
• 4-6 sweet potatoes
• 1 tsp. ground thyme