Pasta: Boil water with oil and garlic powder. Cook pasta Aldente (a little hard). Drain, set on paper towel to dry (dry but manageable).
Spinach: Defrost 2 small boxes. Set on paper towel (like a sandwich) and squeeze dry. Put in blender with spices (oregano -replace with basil if necessary- , salt and pepper, and parsley flakes).
Onion (one, large): Roughly chop. On pan put 2 tablespoons of butter with same spices as spinach, add onion. Saute- don't brown. Place onion in paper towel and dry excess of. Add onion into spinach.
Add ricotta cheese to spinach.
Meat: Brown in pan on same pan used for onion (don't clean pan). Drain and add into spinach.
Blend until smooth. Stuff shells.
Place shells into glass casseroles (grease with butter). Add maerinera sauce (enough to cover but not drown), add mozzarella cheese and same spices on top. Place in over for 30 min and watch (350f)