2 tablespoons butter
1/2 onion thinly sliced
1 small zucchini sliced in rounds 1/8 to 1/4 inch thick
1 small yellow squash sliced in rounds 1/8 to 1/4 inch thick
2 large cloves garlic minced
1/2 cup heavy cream
1/4 cup grated parmesan
1 cup shredded smoked gouda
Preheat oven to 450 degrees.
Melt butter in oven proof skillet over medium heat. Add onion and cook until the edges start to brown approximately 5 minutes. Add garlic and cook for additional 1 minute. Add cream and simmer until bubbly and starting to thicken. Slowly stir in parmesan. Add zucchini and yellow squash and cook an additional 4-5 minutes.
Sprinkle with smoked gouda and bake in the oven for 15-20 minutes or until cheese is golden brown.
Credit to: Zucchini Gratin with Yellow Squash | Small Town Woman