Lasagna Roll-Ups without oregano

16 cremini mushrooms , caps cleaned with a damp towel and finely chopped in food processor 1 small yellow onion , finely chopped 2 -4 garlic cloves , minced 2[...]

12 uncooked lasagna noodles 1 lb lean ground beef 1 large onion , chopped 1 (14 ounce) jar spaghetti sauce 1 (8 ounce) can mushroom stems and pieces ,[...]