Start by bringing a large pot of salted water to a rolling boil. Cook the egg noodles according to the package directions. Once done, drain them thoroughly and set them aside.
Preheat your oven to 400°F (200°C).
In a Dutch oven, melt the unsalted butter over medium heat. Add the minced garlic and diced shallots, stirring frequently until they release a fragrant aroma, approximately 2 minutes.
Sprinkle in the flour, whisking constantly until the mixture becomes lightly browned, about 1 minute.
Gradually pour in the half and half, followed by the Dijon mustard. Continue to stir the mixture until it thickens slightly, which should take around 4-5 minutes.
Remove the pot from the heat source and immediately stir in the shredded sharp white cheddar cheese. Mix until the cheese melts smoothly into the sauce, about 2 minutes.
Gently fold in the cooked egg noodles, drained tuna, and rinsed green peas until everything is evenly combined. Season with Kosher salt and freshly ground black pepper according to your taste.
In a small bowl, mix together the Panko breadcrumbs, freshly grated Parmesan, lemon zest, and olive oil until the ingredients are well incorporated.
Sprinkle the Panko mixture evenly over the top of the pasta mixture.
Place the Dutch oven in the preheated oven and bake until the dish becomes golden brown and bubbly, typically between 25-30 minutes.
Serve immediately, garnishing with chopped fresh chives for an added touch of freshness, if desired.