Ingredients 3 tablespoons olive oil One 12.84-ounce box frozen mini potato-cheese pierogies 1/2 pound sweet Italian sausage (about 3 links) 2 cloves garlic, smashed and roughly chopped Pinch red pepper flakes 1 pound frozen broccoli spears, thawed (split any spears that are very large) 1 cup low-sodium chicken broth 2 tablespoons grated Parmesan, plus more