Optional: Soak pinto beans in water overnight or for at least 8 hours, then drain and rinse before cooking.
Prepare the slow cooker by coating with a light coating of cooking spray.
Add the pinto beans, chicken broth, chopped onion, minced garlic, cumin, paprika, bay leaf, salt, and pepper to the slow cooker and stir to combine.
Cover and cook on low for 8–10 hours or on high for 5–6 hours, until beans are tender and creamy.
Remove the bay leaf, taste and adjust seasoning as needed before serving.