Sweet Potato Gruyere Gratin - Side Dishes | BLACK + DECKER

Ingredients

• 4 sweet potatoes, sliced with slicing blade (thickest setting)
• 4 russet potatoes, sliced with slicing blade (thickest setting)
• 4 cloves garlic, chopped
• 1 leek
• 1 tsp. ground thyme
• 1 tsp. dried sage
• 1 tsp. salt, more to taste
• 1 tsp. black pepper, more to taste
• 4 Tbsp. butter for sauce, butter for coating slow cooker
• 4 Tbsp. flour
• 3 cups whole milk
• 8 oz gruyere, shredded with shredding blade*
• Salt and pepper for seasoning