Salisbury Steak Meatballs with Mushroom Gravy

Ingredients:

• 2 tbsp olive oil

For the Meatballs:

• 1 cup breadcrumbs - , regular, Panko or GF
• 1/4 cup milk or water
• 1½ lb lean ground beef - (or up to 20% fat)
• 2 eggs - large
• 1/2 cup onion - diced fine
• ¼ cup Ketchup
• 1 tablespoon dry mustard - [SEE NOTE 1]
• 1 tbsp Worcestershire sauce - SEE NOTE 2]
• 1 tsp Kosher salt
• 1 tsp ground black pepper

For the Gravy:

• 2 tbsp butter
• 1 Onion - large, chopped
• 8 oz cremini mushrooms - , sliced
• 1 tbsp Worcestershire sauce [See Note 2]
• 1 cup unsalted beef broth
• 2 tbsp cornstarch [See Note 3]
• salt and ground black pepper - , to taste
• Optional Garnishes:
• chopped fresh parsley
• fresh thyme

Instructions:

1. If you're serving the meatballs with mashed potatoes, fill a medium pot with water about 3/4 full and cover with a tight-fitting lid. Heat this over high heat to bring to a boil. You want just enough water to cover the potatoes during cooking. 
2. While the water is heating, peel and dice the potatoes. Remember: Smaller potatoes cook faster thank large chunks. 
3. Add these to the pot even if the water is not boiling yet. Be sure to salt the water liberally.
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