Bring a medium pot of water to a boil. Slightly salt the water and then add the pasta. Cook according to directions for al dente.
While the pasta is cooking dice up all the other ingredients.
Drain the pasta once cooked. In the same pan add the cherry tomatoes. Cook over medium heat for a minute. Then add in the spinach and cook until wilted. The juice from the tomatoes should prevent the spinach from sticking but you can also add a drizzle of olive oil. Add in the roasted red peppers, pepperoncini's, olives, and pasta. Add the pesto and stir until all combined.
Dish up pasta and top each serving with some feta cheese