Toast pepitas in a dry skillet over medium heat, tossing often, until seeds turn golden and start to pop, about 3 minutes.
Transfer to a bowl to cool.
With food processor running, drop in garlic to chop. Pulse in parsley, lemon zest and juice, red pepper and 1/2 tsp. salt. Pulse in cheese and pepitas. Scrape down sides of bowl. With machine running, drizzle in oil. Season with salt and pepper.