Preheat oven to 400 degrees.
Prepare the naan. Spoon ¼ cup of pesto onto each bread and spread evenly.
Top pesto with Old El Paso green chiles and cheese slices.
Heat butter or oil over medium heat in a medium saucepan. Once butter is melted, add shrimp, red chile powder, and oregano.
Cook shrimp, stirring occasionally, until pink and firm. If you are using cooked shrimp, cook until heated through.
While the shrimp is cooking, place prepared naan breads directly on the oven rack for 4-8 minutes. Length of time will depend upon the type of bread. Cook until cheese is melted and bread is crisp on the bottom.
Remove naan from the oven and place on serving plate.
Top with cooked shrimp and extra green chiles.