Preheat oven to 375 degrees F (190 degrees C). Grease a 9×13-inch baking dish.

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Beat cottage cheese, butter, and eggs in a large bowl. Stir corn bread mixes into butter mixture until just moistened. Fold in broccoli, onion, and 1 cup Cheddar cheese. Pour batter into prepared baking dish and sprinkle with remaining 1/2 cup Cheddar cheese.

Bake in the preheated oven until a toothpick inserted into the center comes out clean, 35 to 40 minutes. Cool in the baking dish for 10 minutes before slicing and serving warm.