I have been making this for 22 years. The recipe comes from Mary Kovach, who used to teach with my mom years ago. This is an easy recipe to prepare and can be made up ahead of time.
1 to 1 1/2 lb hamburger(uncooked)
1/2 c milk
2 slices white bread broken into small pieces
1/2 lb shredded mozzeralla cheese
Mix all ingredients together and stuff manicotti noodles that you have cooked less time that package says. They should be tough.
Place in a baking dish(9 x 13) and pour a mixture of 1 jar of Ragu--or other spaghetti sauce and 1 small can of tomato sauce over stuffed noodles. Bake at 350 for 30-40 minutes. Can be prepared the night before and refrigerated until ready to bake.