Adjust oven rack to middle position and heat oven to 450 degrees F.
Sauté diced onion, in 2 tablespoons oil and 1 tablespoon butter, over medium heat, until translucent - about 4 minutes. Add minced garlic, cumin, chili powder, salt and black pepper. Stir, set heat to low, and cook 30 seconds, stirring often.
Add chicken and tomatoes. Stir and cook until liquid evaporates, about 1 minute.
Add juice of ½ lime and beans, stir and cook until beans are heated through.
In a small microwave-safe dish, heat 3 tablespoons butter and 6 tablespoons canola oil until butter is melted. Stir well.
Brush a rimmed baking sheet with 1/3 of the butter/oil mixture and set it in the oven for 2 minutes.
Spread 1-tablespoon Queso cheese in the center of a tortilla. Add ½ cup chicken/bean mixture and 2 tablespoons Mexican rice. Top with 2 tablespoons shredded cheese. Fold the sides and one end of the tortilla over the filling and roll it up to the other end.
Remove the hot baking sheet from the oven and brush it liberally with the melted butter/oil mixture.
Press the filled tortilla down a little and place it seam-side down on the hot sheet pan.
Repeat the process with all tortillas.
Brush the tops of the Chimichangas with the melted butter/oil mixture and bake for 10 minutes.
Remove the pan from the oven and flip the Chimichangas over. Brush the seam side with melted butter/oil and bake an additional 8-10 minutes or until golden and crispy.
Turn off the oven and remove the Chimichangas from the oven.
If desired, spread 2 tablespoons Queso cheese on top of each Chimichanga and return them to the oven just to melt the cheese a little.
Serve Chimichangas with Mexican rice, beans, pico de gallo, shredded lettuce, sour cream, tortilla chips & salsa – whatever Mexican side dishes you love. Give a little squeeze of lime juice, and…The Best Margarita!!!
Enjoy!