Preheat the oven to 450°F. Grease an 8 x 8 baking dish with the olive oil.
Crack the egg into a large bowl, and beat it with a fork. Add the turkey, panko, ricotta, parsley, Italian herb blend, salt, and pepper to taste. Mix with a fork until the ingredients are evenly distributed.
Form 12 meatballs and place them in the baking dish in rows, shoulder-to-shoulder in a grid. Bake for 10 minutes.
Pour the tomato sauce over the meatballs and bake for an additional 15 minutes or until the temperature on an instant-read thermometer reaches 165°F when inserted into the center of a meatball.
To serve, place a meatball and about a tablespoon of sauce on each slider bun.