Preheat your oven to 350°F (175°C).

In a large skillet over medium heat, add a tablespoon of oil or butter. Add the diced onion and minced garlic, and sauté for 4-5 minutes until the onion is translucent.

Chop the yellow squash into small pieces and add it to the skillet. Cook for 8-10 minutes until the squash is tender and starting to brown.

In a large mixing bowl, combine the sautéed squash mixture, shredded cheese, and eggs. Stir in salt and pepper to taste.

In a separate bowl, mix the breadcrumbs with a drizzle of olive oil or melted butter.

Spread the squash mixture into a greased baking dish and sprinkle the breadcrumb mixture on top.

Bake in the preheated oven for 30-35 minutes until the top is golden brown and bubbly.