Comfort Meatballs

This is my take on a recipe from The Pioneer Woman. The meatballs taste like meat loaves, and I think this shape is more appealing to little people. I served ours with buttermilk mashed potatoes.
1 1/2 lbs ground beef (or 1 lb ground beef and 1/2 lb Italian sausage)
3/4 cups old-fashioned oats
1 cup milk
3 Tbsp. finely minced onion
1 1/2 tsp. salt
1 to 1 1/2 tsp. black pepper
Canola oil
1/2 cup ketchup
1/2 cup tomato sauce
2 Tbsp. brown sugar
3 Tbsp. white vinegar
2 Tbsp. Worchestershire sauce

1. Combine ground beef and next 5 ingredients. Roll into balls. (I used a 1-Tbsp. cookie scoop.)
2. Heat canola oil to cover the bottom of a large skillet. Brown meatballs, in batches. Remove meatballs to a baking dish.
3. Combine ketchup and next 4 ingredients; pour over meatballs in baking dish.
4. Bake at 400° for 30 minutes or until done.