Slice each zucchini in half lengthwise, then scoop out the insides. Discard the insides or use them for something else. (I'm not sure what you can use zucchini insides for, but you're clever and I'm sure you'll figure something out. I compost mine.)
Heat oil in a large skillet over medium-high heat. Add garlic and spices (chili powder through cayenne). Cook until fragrant, about 1 minute, stirring often. Stir in the tempeh, corn, and jalapeños and cook until they're beginning to brown, 3-5 minutes, continuing to stir often. Add the tomatoes and broth to the skillet and cook until the liquid has absorbed, about 2 minutes more. Stir in ½ cup of cheese and season to taste with salt and pepper.
Fill each zucchini half with the tempeh mixture, then top with the remaining cheese. Transfer zucchini to a baking dish or sheet and bake for 15-20 minutes, or until the tops are browned. Serve with cilantro, lime wedges, and other taco-y things.
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