- 1.5 lbs beef sirloin tips cut into 1-inch cubes
- 1 tablespoon vegetable oil
- 2 tablespoons unsalted butter divided
- 1 medium yellow onion sliced
- 8 oz mushrooms sliced
- 2 garlic cloves minced
- 2 tablespoons all-purpose flour
- 2 cups beef broth
- 1 tablespoon Worcestershire sauce
- 1 teaspoon salt plus more to taste
- 1/2 teaspoon black pepper
- 1/2 teaspoon garlic powder
- Fresh parsley chopped, for serving