I give credit of this recipe most to America's Test Kitchen. But I also improvised a little bit. It's much easier than stuffing mannicotti noodles!
For cheesey middle:
3 cups ricotta cheese
2 cups grated mozzarella
1 cup Parmesan (I used the green can, though I'm sure fresh might be better)
one bag spinach, sauteed and squeezed dry (optional, but a great way to add a little bit of folate to your diet)
Mix all ingredients together, set aside
One box oven ready/no boil lasagna noodles. (this is the secret to the easy part)
Boil water in a teapot, pour into 9x13 pan, and one by one, layer noodles in hot water. Leave for 5 minutes, or until plyable. (I got sidetracked today and waited longer than 5 minutes, and they stuck together... this had never happened before... so 5 minutes or less is the key)
Take noodles out, lay on clean towel, spread some cheese mixture onto noodle and roll up. voila! Mannicotti.