Mix yogurt, garlic, lemon juice, paprika, cumin, salt, turmeric, coriander, pepper, and cinnamon in the slow cooker.
Stir until spices are fully blended into the yogurt.
Add chicken thighs and stir to coat each piece evenly.
Cover and cook on low 4-5 hours or high 2-3 hours until chicken reaches 165°F.
Shred or slice the chicken in the slow cooker and stir into the sauce.
Grate cucumber over a towel, then squeeze out as much water as possible.
Mix squeezed cucumber with yogurt, garlic, lemon juice, olive oil, dill, and salt until smooth.
Divide rice among bowls, top with chicken and sauce.
Add salad, tzatziki, pickled onions, and a lemon wedge to each bowl.
Let everyone build their own bowl with desired toppings.