Preheat oven to 400°; heat 1 tbsp oil over med-high in an oven-safe skillet; pat chicken thighs dry, season with salt/pep + sear 3 min per side; remove chicken + reserve pan juices

Drain + rinse beans + mince shallots; heat 1 tbsp oil in same skillet over med, add beans + shallots + cook 1-2 min, scraping up brown bits; top beans with chicken then place skillet in oven; bake 20-25 min until chicken is cooked through

Remove skillet from oven + remove chicken from pan; heat skillet over med on stove; add spinach to beans + sauté 3-4 min until wilted; return chicken to pan + squeeze ½ lemon over top of chicken

Divide chicken to plates; serve each with lemon wedges + ¼ cup tzatziki