Preheat and Prepare: Preheat your oven to 400°F (200°C). Line a large baking sheet with parchment paper. Prepare all vegetables and herbs as listed in the ingredients.
Make the Yogurt Sauce: In a small bowl, combine the non-fat Greek yogurt, grated and squeezed cucumber, 3 cloves of minced garlic, minced jalapeño, fresh lemon juice, chopped dill, and extra virgin olive oil. Season generously with black pepper and stir until uniformly blended. Cover and refrigerate while you prepare the kofta to allow the flavors to meld.
Combine the Kofta Mixture: In a large mixing bowl, add the ground chicken, whole wheat breadcrumbs, diced red onion, grated zucchini, 4 cloves of minced garlic, the second minced jalapeño, all fresh herbs (parsley, mint, dill), dried oregano, lemon zest, sumac, black pepper, and kosher salt. Use your hands to gently but thoroughly combine the ingredients. Do not overmix.
Shape and Arrange: Slightly dampen your hands with water to prevent sticking. Form the chicken mixture into 24 small, oblong kofta shapes (4 per serving). Arrange them on the prepared parchment-lined baking sheet, ensuring they have space between them for even cooking.
Bake the Kofta: Place the baking sheet in the preheated oven. Bake for 17-20 minutes, or until the kofta are golden brown and an instant-read thermometer inserted into the center of one registers 165°F (74°C).
Assemble the Pockets: Gently warm the whole wheat pitas in the oven for the last minute of baking or in a toaster. To serve, slice the top off each pita to create a pocket. Spread a generous layer of the spicy yogurt sauce inside. Add 4 kofta, then layer with sliced tomatoes, cucumbers, and red onion. Top with a sprinkle of crumbled feta and a few sprigs of fresh dill. Serve immediately.