Prep the chicken: Pat the chicken dry with paper towels. This helps it sear better if you choose to brown it first and prevents watery sauce.
Optional sear for extra flavor: Heat a skillet with a little olive oil and quickly brown the chicken 1–2 minutes per side. It’s not required, but it adds depth.
Build the sauce: In a bowl, whisk together lemon juice, lemon zest, garlic, olive oil, chicken broth, oregano, thyme, salt, pepper, and smoked paprika.
Layer the slow cooker: Add sliced red onion to the bottom.
Place chicken on top. Pour the lemon-herb mixture over the chicken.
Slow cook: Cover and cook on Low for 4–5 hours or High for 2.5–3 hours, until the chicken is tender and reaches 165°F internally.
Add the mix-ins: In the last 30 minutes, stir in olives and roasted red peppers. This keeps their flavors bright.
Finish and serve: Taste and adjust seasoning.
Sprinkle with feta and fresh parsley or dill. Serve with lemon wedges.
Choose your base: Spoon over rice, orzo, couscous, cauliflower rice, or a Greek-style salad. The sauce is great for drizzling.