Combine all ingredients and let chicken marinate for at least 30 minutes, or up to 3 hours.
Preheat oven for 425° F.
Spread chicken thighs out on a 11x17" baking sheet, leaving space between each piece.
Bake for 15-20 minutes on the middle oven rack, until chicken is cooked through. Move your oven rack up to about 6" from the roof of your oven.
Let your chicken rest until it's cool enough to handle, then slice into 1/2 inch thick strips. Broil for 5-6 minutes, until chicken is golden brown in spots.
Tzatziki Sauce
Combine finely minced garlic with a pinch of kosher salt on your cutting board, using the side of your knife to create a paste.
Combine yogurt, garlic paste, finely diced cucumber, lemon juice, garlic powder and dill. Season to taste with salt and pepper
Greek Chicken Bowl
Cook Quinoa according to package directions.
Divide quinoa between four bowls. Top each bowl with a serving of sliced chicken, a handful of cherry tomatoes, and a dollop of tzatziki sauce. Top with crumbled feta and sliced olives.