First, preheat your oven to 375F. Then, bring a large pot of water to a boil. Once boiling, season heavily with salt and add pasta shells. I recommend cooking some extra in case they break. Cook to al-dente according to package directions, about 9 minutes. Once done, drain off water and lay them out on a baking sheet to cool down.
22 jumbo pasta shells
Meanwhile, bring a large, high-sided pan to medium heat. Once hot, add butter and let it melt. When the butter is melted, add the onion and season with salt. Sauté, stirring occasionally, for about 2 minutes. Then add garlic and cook for 30 more seconds or until fragrant. Add in flour and stir constantly for 2 minutes.
3 tbsp unsalted butter, ½ medium yellow onion, 3-4 garlic cloves, ¼ cup AP flour
Very slowly pour in the milk (a few tablespoons at a time), stirring well after each addition. Once all the milk has been added, continue stirring, and allow it to bubble up - about 2-3 more minutes.
3 cups whole milk
Reduce heat to medium low and add in the shredded cheddar, parmesan and a generous amount of salt and pepper. Stir until the cheese has melted and the sauce has thickened. Remove from heat and set aside. The sauce may develop a film on top as it sits, but just stir it back in before using.
1 cup freshly shredded sharp cheddar cheese, ½ cup freshly shredded parmesan cheese, kosher salt & black pepper
In a large bowl, add the tuna, peas, spinach, blended cottage cheese, shredded cheddar and about 1/2 cup of the sauce. Season with salt and pepper to taste. Stir until combined.
1 cup cottage cheese, 10 oz Wild Planet albacore tuna, 1 cup frozen peas, 8 oz frozen chopped spinach, 1 cup freshly shredded sharp cheddar cheese, kosher salt & black pepper
Pour 3/4 cup of the sauce into the bottom of a 9x13” baking dish. Then, stuff each shell with a large spoonful of the filling. Add stuffed shells to the baking dish. Pour remaining sauce over the top of the shells and spread out evenly.
In a small bowl, combine the breadcrumbs, melted butter, parsley, salt and pepper. Then, spread this mixture evenly over the top of the stuffed shells.
½ cup panko breadcrumbs, 1 tbsp unsalted butter, 1 tsp dried parsley, ½ tsp kosher salt, ¼ tsp black pepper
Transfer baking dish to the oven and cook for about 25 minutes. Optionally, garnish with chopped chives or parsley. Enjoy!