Preheat the oven to 350°F (175°F). Bring a large pot of lightly salted water to a boil. Add pasta and cook for 8 to 10 minutes or until al dente; drain. Transfer to a deep dish 9- x 13-inch baking dish.
In a medium bowl, whisk together the eggs and milk. Season with salt and pepper. Dip the chicken breasts in the egg mixture, then roll in bread crumbs to coat. Heat the olive oil and butter in a large skillet over medium-high heat. Fry the chicken breasts until the juices run clear, and they are well browned on both sides. Remove to paper towels to drain. Drain excess oil from the chicken pan, leaving it coated.
While the chicken is cooking, place the bacon in a large, deep skillet. Cook over medium-high heat until crisp. Remove the bacon from pan. crumble and set aside.
Place the skillet that used to have chicken in it over medium heat. Add tomato, onion, bacon, and cook for about 3 minutes, or until onion is soft. Pour in the barbecue sauce, and spicy mustard. Simmer for 5 minutes. Pour the sauce over the pasta in the dish, then place the chicken on the top, and cover with shredded Monterey Jack cheese.
Bake for 15 to 20 minutes in the preheated oven, until cheese is melted and dish is heated through.