2 tablespoons unsalted butter
4 tablespoons vegetable oil
1 yellow onion, chopped
3 cloves garlic, minced
1 jalapeno pepper, diced (remove seeds for less heat)
1 1/2 teaspoons chili powder
1/2 teaspoon ground cumin
1/4 teaspoon ground cinnamon
sea or kosher salt
1 small tomato, chopped, plus more for topping
2 tablespoons chopped fresh cilantro
2 1/2 cups shredded rotisserie chicken or cooked chicken, cut into bite-size pieces
1/4 cup sour cream, plus more for serving
1 (15-ounce) can refried beans
4 (10-inch) flour tortillas
1 cup shredded Monterrey jack cheese, plus more for topping
Mexi-sauce
Shredded lettuce, for topping
Mexican rice, for serving
Chi-Chi’s Mexi-sauce:
1/2 cup onion, chopped
2 garlic cloves, minced
pinch of each: chile powder, cumin, sugar and salt
2 (4 ounce) cans green chiles, drained and rinsed
1 cup chicken broth
Preheat the oven to 450 degrees F. Melt the butter with 2 tablespoons vegetable oil in a skillet; transfer to a bowl. Heat the remaining 2 tablespoons oil in the skillet and add the onion, garlic and jalapeno, cook over medium-low heat until soft. Add the chili powder, cumin, cinnamon and 1 teaspoon salt; toast 30 seconds. Add the tomato and cilantro and cook until slightly dry, about 2 minutes. Stir in the chicken and sour cream and warm through. Remove from the heat.
Brush a rimmed baking sheet with some of the butter-oil mixture. Spread 2 tablespoons refried beans down the center of each tortilla, leaving a 2-inch border on both ends. Top with 1 cup chicken mixture and 1/4 cup cheese. Fold in the ends and roll up.
Put the chimichangas seam-side down on the baking sheet; brush with the butter-oil mixture. Bake 8 to 10 minutes per side, brushing again after you flip. Top with the sauce, more cheese, lettuce and tomato. Serve with rice and the remaining beans.
Make Mexi-sauce: Saute 1/2 cup chopped onion and 2 chopped garlic cloves in a skillet over medium-low with heat in a tablespoon or two of vegetable/olive oil. Add a pinch each of chili powder, cumin, sugar and salt; cook 30 seconds. Stir in two 4-ounce cans chopped green chiles and cook 2 minutes. Add 1 cup chicken broth and simmer until thickened, then puree. Stir in 1/4 cup chopped cilantro.