How many ways can you make stuffed shells??
I'm on version three now, and while this is probably my least favorite, it's still a decent meal.  Perfect for Fridays during Lent or another night when you want a meatless meal.  The sauce is quite thin, which I didn't care for, but the actual shell itself is pretty good.  Next time I make these I need to adjust the sauce to make it thicker!  I did freeze half of these and they did very well.  I'm starting to love these cook once, eat twice meals!!

Tuna Filled Shells
Source: 
AllrecipesServes 6 (2 shells each)
INGREDIENTS
12 Jumbo Pasta Shells
5 teaspoons all-purpose flour 
2 cups 2% milk 
1 teaspoon dill weed 
1/2 teaspoon salt 
1 celery rib, diced 
1 small onion, diced 
1 tablespoon canola oil 
2 slices white bread, crumbled 
(I used 1/4 c bread crumbs)1 (12 ounce) can light water-packed tuna, drained and flaked 
1/2 cup reduced-fat ranch salad dressing 
1/2 cup shredded part-skim mozzarella cheese 
DIRECTIONS
-Cook shells as directed on the box.
-Preheat oven to 350 degrees
-Meanwhile, combine the flour, milk, dill and salt until smooth.  
-Boil flour mixture and stir constantly for 2 minutes or until thickened.
-Pour 1-1/4 cups of sauce into a 2 quart baking dish and set aside. 
-Sautee celery and onion in a skillet until tender. 
-Add bread, tuna, salad dressing and cheese.  Mix well.
-Fill cooked shells with tuna mixture and place open side up in a baking dish. 
-Drizzle remaining sauce on top.
-Cover and bake until bubbly, approx. 25-30 minutes.
NUTRITION INFO
Calories 299.7
Total Fat 10.5 g 
Cholesterol 31.2 mg 
Sodium 529.6 mg 
Potassium 333.2 mg 
Total Carbohydrate 27.9 g
Fiber 1.5 g 
Protein 22.8 g