Preheat the oven and place the popcorn chicken on the baking sheet; cook until done, according to package instructions.
Pour the canned sloppy joe sauce in a large saucepan over medium heat, Stir in the brown sugar and crushed red pepper flakes until sugar has dissolved. Heat until almost at the boiling point then turn heat down to low and simmer for 5 minutes.
While the chicken and sauce are cooking, prepare the tomatoes, onion, jalapeno, and lettuce.
Remove the chicken from the oven and toss in a large bowl with the homemade bbq sauce.
Melt colby jack cheese and milk in the microwave for 1 minute in 30 second intervals, stirring after each interval and the cheese melts.
On a large plate, place an even layer of crispy tortilla chips, then layer as follows with the ayer platter with chips, top with lettuce, chicken, cheese sauce, fresh tomatoes, onion, jalapeno and sour cream. Garnish with chopped cilantro.