Cut 1 pound yellow summer squash into ½-inch thick slices and place them in a large mixing bowl.
Drizzle 1 tablespoon olive oil over the squash, then season with 1 teaspoon salt, ½ teaspoon black pepper, and ½ teaspoon garlic powder. Gently toss to evenly coat the squash.
Arrange the squash in a single layer on a baking sheet. Sprinkle ¼ cup grated parmesan cheese evenly over the top.
Bake for 9–11 minutes, until the squash is just tender.
Switch the oven to broil on high and cook for 3–4 minutes, until the cheese and squash begin to brown.
Remove from the oven and serve immediately while warm.
Notes
Refrigerate the leftovers in an airtight container for up to 3-4 days.