Preheat the oven to 375 degree F. Grease a 9 X 13 inch baking dish, or spray with nonstick cooking spray.
In a large mixing bowl, combine the cornbread mix, eggs, sour cream, melted butter, garlic powder, paprika, and salt. Whisk until smooth.
Cut the largest broccoli florets in half. Add the broccoli, diced onion, and 1 1/4 cups shredded cheese to the cornbread mixture. Stir until well combined.
Pour the batter into the prepared pan. Sprinkle the remaining 3/4 cup shredded cheese over the top.
Bake for approximately 40 minutes, until the edges are golden and a toothpick inserted into the center comes out clean. Cool for 10 minutes before cutting to serve.