Pre heat oven to 375. Arrange the peppers on a baking sheet cut side up. Drizzle with olive oil and sprinkle with salt. Roast for 15-20 minutes or until softened and starting to brown at the edges.
While the peppers are roasting, make the tuna mixture. Smash the cannellini beans with the olive oil in a large bowl first and then add all of the ingredients for the tuna and mix together. Season with salt and pepper to taste.
Arrange the peppers on a platter, fill each pepper with the tuna mixture and drizzle with a bit of olive oil if you want, finish with some more fresh parsley and flaky salt!
Keyword easy appetizer, Italian tuna salad, mini pepper appetizer, tuna salad