Preheat your oven to 350°F.
In an 8x8-inch baking dish, combine the grated zucchini, sweet corn, and bacon grease. Stir until everything is evenly coated.
In a mixing bowl, whisk together the eggs, milk, and all-purpose seasoning until well combined. Pour the egg mixture over the zucchini and corn mixture. Add the shredded cheese and gently stir to distribute the ingredients evenly.
Bake for 35 to 45 minutes, or until the center is set and no longer jiggles. Remove from the oven and let the casserole cool for 10 minutes before serving.