Preheat oven to 375 degrees and lightly grease a baking sheet. Trim the ends of the zucchinis off. Slice each zucchini in half, then slice each half into 3 long wedges.
Place all the zucchini wedges in a single layer on the prepared baking sheet. Sprinkle with salt and pepper, garlic powder, cayenne pepper, ranch seasoning, and parmesan cheese.
Bake zucchini for 10-15 minutes until fork-tender and cheese is melty. Serve immediately.