Prep the chicken: Pat chicken dry and slice thicker breasts in half horizontally for even cooking.
Add to a bowl or zip-top bag.
Mix the marinade: Whisk olive oil, lemon zest and juice, garlic, oregano, cumin, salt, pepper, and red pepper flakes. Pour over chicken, toss to coat, and marinate 20–30 minutes (or up to 8 hours in the fridge).
Cook the chicken: Grill pan/skillet: Heat a lightly oiled pan over medium-high. Cook 4–6 minutes per side until browned and internal temp reaches 165°F/74°C.
Oven: Bake at 425°F/220°C for 18–22 minutes, depending on thickness.
Air fryer: 380°F for 12–15 minutes, flipping halfway.
Make the cauliflower rice: Heat 1 tablespoon olive oil in a large skillet over medium.
Add cauliflower rice, a pinch of salt and pepper, and cook 4–6 minutes until tender but not mushy. Optional: squeeze in a little lemon and sprinkle with chopped parsley.
Prep the veggies: Dice cucumber, halve tomatoes, slice red onion, and pit/halve olives. Crumble feta and chop herbs.
Make the tzatziki: Stir yogurt, grated cucumber (squeezed dry), lemon juice, olive oil, garlic, salt, and pepper.
Adjust to taste. For extra zip, add a splash of red wine vinegar or more lemon.
Assemble bowls: Divide cauliflower rice among 4–5 meal prep containers. Top with sliced chicken, cucumbers, tomatoes, onions, olives, and feta.
Sprinkle with herbs.
Add sauce smartly: Portion tzatziki into small lidded cups, or spoon it onto one corner just before eating. A drizzle of olive oil and a squeeze of lemon on top is great too.
Cool, then store: Let everything cool to room temp before sealing the containers to avoid condensation.