In a large skillet, heat the olive oil over medium-high heat.
Add the onion, garlic and petite tomatoes, stirring frequently until soft and dry.
Crumble the ground turkey, adding it to the pan. Continue to crumble while cooking. Mixture will be dry, but if it starts to stick, add a little more oil.
While cooking, cut the zucchini in half lengthwise. Spoon out center with a spoon or melon baller, you can reserve for salads, dressing or a smoothie or discard.
Spoon the turkey mixture into the zucchini boats.
Heat the grill to medium-high heat and oil the grates. Carefully set the zucchini onto the grates on direct heat using a fish spatula (or other long spatula). Grill for 5-8 minutes, or until zucchini is tender, but still holds its shape.
Sprinkle with cheese and close lid with heat off for 1-2 minutes to allow cheese to melt. Remove and serve immediately.
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