Chicken Flautas

Name: Chicken Flautas
Ingredients: 3 cups shredded chicken (2 chicken breasts); 12-16 corn tortillas; 2 cups shredded cheese (I used Mozzarella); 1/4 onion; 1/2 cup pickled jalapenos; 2 teaspoons chili powder; 2 teaspoons Mexican oregano; 1 teaspoon salt; freshly cracked black pepper; For the Avocado Salsa Verde:; 4 tomatillos; 1/2 onion; 1 garlic clove; 2 serrano peppers; 10-12 sprigs cilantro; 1 avocado; salt to taste