Marinated Venison (or Beef) Medallions

This one is a shout out for my Daddy, brother, & all my other hunting friends out there.
Marinated Venison Medallions with Onions & Mushrooms
4 venison steaks*, trimmed & cut into medallions
1 medium onion, diced
8oz. button mushrooms, sliced
1/2 cup balsamic vinegar
1/4 Worcestershire sauce
1 Tbls. garlic powder
1/2 Tbls. Dried oregano
Fresh ground black pepper to taste.
Combine ingredients in a large glass baking dish, allow to marinate at least 1 hour. Then bake at 325 for 1 hour.
*you could substitute beef steak if you prefer.