Cheesy Zucchini Gratin Recipe

Preheat oven to 400 degrees F (200 degrees C).

Mix Gruyere cheese and panko bread crumbs together in a bowl.

Heat butter in a large skillet over medium heat until melted. Add zucchini yellow squash shallots and garlic; cook and stir until softened about 10 minutes. Stir in basil rosemary salt and black pepper; cook until fragrant about 1 minute.

Mix flour into the skillet. Pour in cream in a steady stream and stir until thickened 3 to 5 minutes. Mix in half the cheese mixture. Remove from heat.

Pour zucchini mixture into a baking dish. Top with remaining cheese mixture.

Bake in the preheated oven until bubbly and golden brown about 20 minutes.