In medium heat pan, melt 1 tablespoon of butter with 1 tablespoon of olive oil. Place in meatballs and brown on all sides.
Remove meatballs from pan, add 4 tablespoons of butter and let it melt.
Once melted, add flour and stir until smooth. Let it cook while stirring for 1-2 minutes to cook out the flour taste.
Add in beef broth and whisk in heavy cream. Stir frequently.
Once simmering, whisk in all seasonings, mustard and Worcestershire sauce. Turn off heat and add the meatballs back in.
Let cool until the sauce thickens while basting meatballs with sauce.
Serve hot over rice, pasta or mashed potatoes.
