Creamy Zucchini and Yellow Squash Au Gratin (Golden and Cheesy) - My Home Made Recipe

Ingredients

• 1 medium zucchini, sliced 1/8 to 1/4 inch thick
• 1 medium yellow squash, sliced 1/8 to 1/4 inch thick
• 1/2 teaspoon kosher salt, plus more to taste
• 1/4 teaspoon black pepper
• 2 tablespoons (28 g) unsalted butter, plus more for the pan
• 1/2 small sweet onion, thinly sliced
• 2 large garlic cloves, minced
• 1 teaspoon fresh thyme leaves, or 1/4 teaspoon dried thyme
• 1/2 cup (120 ml) heavy cream
• 1/3 cup (30 g) finely grated Parmesan cheese
• 3/4 cup (85 g) shredded smoked gouda