Salisbury Steak Meatballs (Instant Pot, Stove Top, Slow Cooker)

INGREDIENTS

2 tsp

olive oil, divided

1/2 cup

minced onions

1/2 lb

93% lean ground beef

1/2 lb

93% lean ground turkey

1/3 cup

whole wheat seasoned breadcrumbs

large egg, beaten

2 tbsp

tomato paste, divided

kosher salt

black pepper

1 tbsp

all-purpose flour

1 tsp

red wine vinegar

2 tsp

Worcestershire sauce, to taste

1/4 tsp

mustard powder

5 oz

sliced mushrooms

1 1/4 cups

reduced sodium beef broth

chopped parsley for garnish (optional)