In a medium skillet, heat olive oil over medium heat.
Cut sirloin thin, and liberally season with salt and pepper
Place strips in the skillet, and brown meat on all sides.
Remove from pan.
In same pan, add in garlic, onions, and mushrooms, and saute until onions are translucent, and mushrooms are tender and brown.
Remove from heat, set aside.
Cook the mushroom ravioli according to package directions, and set aside
Meanwhile, in a saute or saucepan...
Melt 1 tablespoon butter in a medium saucepan.
Use a whisk, and whisk flour into the butter, stirring constantly, for a couple minutes.
Gradually stir in beef broth, whisking and cooking until thickened and smooth. Let the liquid reduce.
Remove from heat, and stir in sour cream, and meat, and mushroom mixture.
Serve over cooked mushroom ravioli, garnish with parsley