Coat the bottom of a 5-quart or larger slow cooker with nonstick spray. Add the potatoes, green bell pepper, red bell pepper, onion, garlic, seasoned salt, paprika, and butter. Drizzle the olive oil over the top, then stir to combine.
Cover and cook on high for 2 1/2 to 3 hours or on low for 4 to 5 hours, until the potatoes are fork tender. The cooking time will vary based upon your slow cooker and the size of your potatoes, so check them a bit early to ensure they do not overcook.
Stir, then add additional salt and/or pepper to taste. Enjoy hot.