Preheat oven to 350ºF
Line a baking sheet with parchment paper. Set aside.
Slice peppers in half lengthwise. Remove seeds and option to remove stem. Rinse under cool running water. Dry and set aside.
Fill each pepper half with a spoonful of pesto. Approximately 1/2-1 tbs, depending on size of pepper.
Place on parchment lined baking sheet.
Drizzle top with oil and sprinkle with Parmesan cheese.
Place in oven and bake for 10-14 minutes, checking after 10. Peppers should look soft and slightly translucent and pesto should be darker and set.
Remove from oven, let cool and serve with or without additional garnish of basil leaf, pine nut and some more cheese.