Preheat and Prepare: Preheat your oven to 350 degrees F. Lightly grease an 8×8 inch baking dish.
Combine Ingredients: In a large bowl, mix together the shredded zucchini, diced onion, half of the cheddar cheese, thawed corn, diced jalapeño, eggs, garlic powder, cumin, salt, and black pepper.
Add Corn Muffin Mix: Gradually stir in the corn muffin mix until everything is fully combined.
Assemble the Casserole: Pour the mixture into the prepared baking dish. Sprinkle the remaining cheese evenly over the top.
Bake: Place the dish in the oven and bake for 50-55 minutes, or until the center is cooked through and the top is golden brown.
Serve Warm: Let the casserole cool slightly before serving to allow it to set up, making it easier to slice.
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