In a slow cooker, mix meatballs, honey bbq sauce, and onion powder until well blended
Cook on low for 4-5 hours, or on high for 2-3 hours
Cook spaghetti to al dente per packaging instructions
Collect 1/2 cup of spaghetti water and drain the rest
Return spaghetti to pot. Mix in butter and 1/2 cup of spaghetti water
Mix in Parmesan cheese until cheese and butter are melted
Serve meatballs over spaghetti and enjoy!