In a large skillet over medium-high, heat 1 tablespoon oil. Add a single layer of zucchini. Cook until the zucchini is golden-brown and gives slightly when pressed, 2 to 4 minutes per side. Transfer to a platter or shallow bowl, season with salt and pepper, and repeat with the remaining zucchini, adding more oil and reducing heat as needed to prevent burning.
To the platter of zucchini, add the garlic, vinegar and 2 tablespoons oil. Toss to coat.
Return the skillet to medium-high and add another tablespoon of oil. Rip the halloumi slices into two or three pieces each and add to the skillet. Cook until golden brown, 2 to 4 minutes per side. Transfer to the zucchini, stir to combine, then top with the herbs. Eat right away.
