Preheat oven to 375°F (190°C).
Slice zucchini in half lengthwise. Scoop out the flesh with a spoon, leaving about 0.5 cm thick shells. Chop the scooped flesh and set aside.
Arrange zucchini halves cut-side up in a baking dish. Brush with 15 ml (1 tbsp) oil and sprinkle lightly with salt. Bake for 15 minutes, until beginning to soften. Remove and set aside.
Heat the remaining 15 ml (1 tbsp) oil in a large skillet. Sauté onion, celery, carrot, and mushrooms until soft. Add the chopped zucchini flesh and cook 3–4 minutes more.
Add ground turkey. Cook until no longer pink, breaking it up as it browns.
Stir in oregano, basil, kelp flakes, and a pinch of salt. Add the chopped kale and cook 2–3 minutes until wilted.
Pour in the no-tomato sauce, stir well, and let simmer for 1–2 minutes. Turn off the heat.
Spoon the turkey-kale mixture into each zucchini boat. Cover the dish loosely with foil.
Bake for 25–30 minutes, until zucchini is tender but still holds shape. Remove the foil and bake it for another 5 minutes to get a nice brown color on top.
Remove from the oven and serve with coconut yogurt on top.