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1
Cook and stir the ground beef in a skillet over medium heat until brown and crumbly, breaking the meat apart as it cooks, about 10 minutes. Drain off excess grease. Set the beef aside.
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2
Preheat oven to 400 degrees F (200 degrees C). Spread the bottom of a 9x13-inch baking dish with about 1 teaspoon of olive oil.
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3
Pour the remaining olive oil into a large skillet over medium-high heat, and cook and stir the zucchini, red bell pepper, jalapeno pepper, garlic, and the white parts of the green onions until the vegetables begin to soften, 3 to 5 minutes. Sprinkle with salt and black pepper, and mix in the tomato paste, chili powder, and cumin. Allow the mixture to simmer until the spices are fragrant, about 1 minute. Remove from heat.
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4
Stir in the browned ground beef, black beans, kidney beans, corn, and 1/4 cup of Parmesan cheese until well combined. Adjust salt and pepper if necessary, and spread the mixture into the prepared baking dish. Top with remaining 1/4 cup of Parmesan cheese, and cover the dish with foil.
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5
Bake in the preheated oven until bubbling in the center, 20 to 25 minutes; remove the foil, return to oven, and bake until the cheese is browned, 5 to 10 more minutes. Sprinkle the remaining green onions (green tops) and cilantro over the top.
