Preheat the oven to 400°F. Line a rimmed baking sheet with parchment paper. Halve the bell peppers from stem to bottom, scoop out the ribs and seeds, rinse, and pat dry. Rub with a little olive oil and a pinch of salt.
Roast the empty peppers cut-side down for 10 minutes until slightly softened but still perky. This pre-roast is the key to keeping them from getting soggy.
While the peppers roast, heat a drizzle of olive oil in a large skillet over medium heat. Cook the diced onion for 5 to 6 minutes until soft and lightly golden at the edges. Add the garlic and cook 30 seconds until fragrant.
Add the ground turkey to the skillet. Break it up with a wooden spoon and cook for 6 to 8 minutes until no pink remains and it is starting to brown.
Stir in the drained fire-roasted tomatoes, tomato paste, smoked paprika, cumin, salt, and black pepper. Let the mixture bubble for 2 to 3 minutes. Fold in the cooked quinoa and the cottage cheese, then remove from heat.
Stir half of the mozzarella into the filling. Taste and adjust seasoning with more salt or a splash of hot sauce if desired.
Set the roasted pepper halves cut-side up in a 9x13 baking dish. Divide the filling evenly among the six halves, mounding it slightly. Sprinkle with the remaining mozzarella.
Bake at 400°F for 20 minutes until the cheese is melted and golden at the edges and the filling is hot all the way through. If the cheese browns too fast, tent the dish loosely with foil.
Let the peppers rest for 5 minutes, then sprinkle with fresh parsley or cilantro and serve warm.