Prepare ingredients: Dice onion, mince garlic, and if using, chop jalapeños. Drain and rinse beans; measure corn.
Sauté aromatics (optional): In a small skillet, heat olive oil and sauté onion, garlic, and jalapeños for 3–4 minutes until softened and fragrant. This step enhances flavor but can be skipped.
Add ingredients to slow cooker: Place chicken breasts/thighs in the crockpot. Add sautéed aromatics (or raw if skipping), white beans, corn, chicken broth, cumin, chili powder, paprika, oregano, salt, and pepper. Stir gently to combine.
Slow cook: Cover and cook on low for 4–6 hours or on high for 2–3 hours, until chicken is cooked through and tender.
Shred chicken: Remove chicken from the crockpot and shred with two forks. Return shredded chicken to the pot and stir.
Finish chili: Stir in sour cream or Greek yogurt if desired for extra creaminess. Adjust seasoning with salt and pepper.
Serve: Ladle into bowls and garnish with fresh cilantro and lime wedges.