1. Heat a large cast iron skillet over medium-high heat. Add oil & beef; cook for 4 minutes or until browned, stirring to crumble.
2. Add mushrooms, onion, and garlic to pan; cook for 3 minutes or until onion is tender. Add tomato paste and rest of ingredients to pan; cook 5 minutes or until mushrooms are tender and liquid evaporates. Spoon about 1 cup beef mixture on bottom half of each bun; top with top halves of buns. *We like to add cheese to the top too!
This a quick easy recipe that is filling & great for game nights. You can even make up a batch and freeze it was a quick reheat when you are too busy to cook.
Notes: If you want to "sneak" in some extra veggies, puree a few carrots and add to the mix while cooking. It adds sweetness and the kids will never know they are in there. ;)