Step 1

Preheat oven to 300°F.

Step 2

Using the textured side of a meat mallet, pound meat to ½″ thickness. Season steaks with salt & pepper.

Step 3

Heat 1 tablespoon of olive oil over medium heat in a dutch oven. Brown steaks on each side (adding additional olive oil if needed). Remove from pan and set aside.

Step 4

Add mushrooms, onions, and 1 tablespoon butter. Cook until tender, about 5 minutes.

Step 5

Add steaks back to the pan. Combine remaining ingredients except cornstarch and pour over steaks. Cover and bake for 2 ½-3 hours or until fork tender.

Step 6

Remove steaks from the liquid and set aside. Whisk cornstarch and 2 tablespoons water until smooth. Bring cooking liquid to a boil and while whisking, add cornstarch mixture a little bit at a time to reach desired thickness.

Step 7

Serve over mashed potatoes.