Preheat your oven to 325°F (162°C) and coat a 9x13 inch baking dish or rimmed baking sheet with nonstick cooking spray. Place a dish filled with hot water on the bottom rack of the oven to create steam.
In a blender, combine ricotta cheese, eggs, mozzarella cheese, Sriracha sauce, sea salt, black pepper, and flour. Blend until the mixture is smooth.
Pour the egg mixture into the prepared baking dish. Bake for 35-40 minutes, or until set and slightly golden on top.
While the eggs bake, heat olive oil in a skillet over medium heat. Add turkey and cook until browned and cooked through, about 10-12 minutes.
Remove the egg base from the oven. Top with Swiss cheese slices and return to the oven until the cheese has melted, about 5 minutes.
Scatter cooked turkey evenly over the cheese-topped egg base. Allow it to cool slightly before slicing.
Toast the bagels until golden. Use butter if desired.
Cut the egg base into 8 even squares and place each onto the bottom half of a bagel. Cap with the top half to form a sandwich.
For storage, cool sandwiches completely, then wrap in parchment or foil. Store in a freezer-safe bag.
Notes
These sandwiches are great for freezing. Defrost in the fridge overnight or thaw in the microwave before reheating.