Before starting the frittata, preheat your oven to 350° F (175° C).
To prepare your mise en place, first prepare the peppers (see the recipe for
Roasted Red Peppers). If using jarred roasted peppers, make sure any excess liquid has been drained.
Next, remove the casing from the sausage. Break the sausage apart into small pieces, about 1/2" -inch rounds. Preheat a small, non-stick fry pan over medium heat and fry the sausage just until cooked through. Remove and drain on paper towels.
Grate the mozzarella cheese and break up the bocconcini into small chunks. Roughly chop the parsley and measure out the cream.