Preheat your oven to 400 degrees f. and line a baking sheet with parchment paper.
Thoroughly wash the bell peppers and pat the excess moisture with a paper towel.
Using a sharp knife, carefully cut the peppers in half, vertically, and scrape out the ribs and seeds.
Place the peppers open-face up on the prepared baking sheet and sprinkle with sea salt and pepper.
Roast for 10 minutes in your preheated oven.
While the peppers are baking prepare the stuffing.
In a large mixing bowl, combine the flaked tuna, cooked rice, peas and shredded carrot. Stir in yogurt, mustard, lemon juice, garlic, and season with sea salt and pepper, to your taste.
Stir well to combine.
Remove the peppers from the oven and carefully stuff them with the tuna mixture.
Sprinkle shredded cheese on top, then bake for 10-12 minutes.
Sprinkle with chopped green onions.
Serve warm and enjoy!
Leftovers should be stored in a food safe container in the fridge for up to 4 days.