ZUCCHINI GRATIN WITH YELLOW SQUASH

Melt butter in an oven-proof skillet over medium heat. Add onion and cook until the edges start to brown, approximately 5 minutes. Add garlic and cook for an 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.
NOTES
The zucchini that I used were on the smaller side. Some of the late summer zucchini I see coming in are much larger. For those, I would double the cream and the Parmesan. The large zucchini are sometimes a little tougher and may require additional simmering and/or baking time.