Step 1

Preheat the oven to 350° F. Set a large 10-12 inch cast-iron skillet on the stovetop. (Or any oven-safe sauté pan.)

Step 2

Use a cheese grater to shred the zucchini, onions, and sharp cheddar cheese. Mince or shred the garlic.

Step 3

Add the butter to the pan and set the heat to medium. Once the butter has melted, add in the zucchini, onions, garlic, Italian seasoning, 1 teaspoon salt, and ¼ teaspoon black pepper. Sauté for 4-5 minutes, stirring regularly, to release the moisture.

Step 4

Then stir in mayonnaise, 1 ½ cups of breadcrumbs, and the grated sharp cheddar cheese. Stir well, then spread the mixture out into an even layer and remove from heat.

Step 5

Sprinkle the remaining ½ cup of Panko breadcrumbs over the top of the zucchini mixture. Then sprinkle with Parmesan cheese. Place the skillet in the oven and bake for 20-25 minutes, until the edges are crispy and the center is bubbling. Serve warm.