Preheat the oven to 400ºF. Line a baking sheet with parchment paper.
Prepare your zucchini by cutting off the ends and slicing them in half lengthwise. Then, place them on the baking sheet and pour over the olive oil, 1 1/2 tsp salt, and 1 tsp pepper. Rub the zucchini.
Spread out the zucchini with the cut side down. Bake for 30 minutes. See above for tips and indicators.
Meanwhile, combine the roughly diced tomatoes, lemon juice, 1/2 tsp salt, 1 tsp pepper, feta, and minced garlic in a bowl. Chop the basil and add it also.
Remove the zucchini from the oven and cool for a few minutes. Flip them over and scoop out the insides, then add them to the bowl.
Add the filling back into the zucchini boats then garnish with extra basil. Enjoy!