Pre-heat oven to 375 degrees.
Slice zucchini in half lengthwise and scoop out the flesh with a spoon, taking care not to break through the skin and reserving the flesh. Place zucchini in a large baking dish and chop flesh.
In a medium sauté pan, heat olive oil over medium heat. Add in onion, garlic, and zucchini flesh, jalapeño, chili powder, and cumin. Stir together and cook for 2 minutes.
Add in turkey and cook for about 7 minutes, breaking turkey up with spoon as you go. When turkey is cooked through, remove from heat and place in bowl. Stir in tomatoes.
Fill zucchini halves with filling and sprinkle with shredded cheese.
Bake zucchini boats for about 25-30 minutes, until they're tender.