Ingredients
- - Kowalski's Butter
- as needed for greasing the baking dish
- 3 tbsp. Kowalski's Extra Virgin Olive Oil
- 2 medium sweet onions
- 1 tsp. minced garlic
- 1 ½ lbs. medium Yukon Gold Potatoes
- unpeeled
- sliced ¼" thick
- 1 ½ lbs. sweet potatoes
- peeled
- 1 ½ tsp. kosher salt
- ¼ tsp. freshly ground Kowalski's Black Peppercorns
- 1 cup (4 oz.) grated Gruyère cheese
- 1 tbsp. snipped fresh thyme
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