This dish is one recipe calling for leftover pasta that is actually worth planning for. It's portable, it's endlessly versatile, and it's practically foolproof. Substitute almost any cheese for the Parmesan (or leave it out altogether) and toss in any cooked vegetable or meat. Make it your own.

Makes: 4 to 6 servings
Time: 40 minutes

Ingredients

• 1/4 pound s…