Preheat oven to 350 degrees
Heat medium sized sauté pan and coat with the olive oil
Toss in red bell pepper, onion, chiles/jalapeno and garlic and cook until softened
While veggies are cooking, mix together remaining chili powder, cumin, oregano, salt and pepper
Remove vegetables from heat and toss in seasonings and shredded chicken
Slowly add reserved poaching liquid until the seasonings coat the other ingredients
In a 9X13 casserole dish, brush 1 tbsp of melted butter to coat bottom
One shell at a time, layer cheese on a tortilla shell and top with chicken mixture
Wrap up each end and then roll sides over to form an envelope
Place the filled shells seam side down in the casserole dish
Line them up next to each other in two rows down the length of the dish
When all the shells have been filled, use the remaining 2 tbsp of butter to brush over the tops
Place chimichangas in the oven and bake for 45 minutes
Serve with sour cream, salsa, gaucamole or other toppings you enjoy