Cut the chicken into bite-sized pieces. Season with 1 ½ tablespoons of the taco seasoning.
Heat heat 1 tablespoon of olive oil over high heat in a large skillet. Add the chicken (in a single layer) and brown each side, cook 1-2 minutes on each side. Depending on the size of your skillet, you may have to do this in two batches and you may need to use an additional tablespoon of oil. Remove the meat to a plate and set aside. With the heat still on high, add 1 tablespoon of olive oil to the skillet and add the onions, bell peppers. Sprinkle the remaining 1 ½ tablespoon of taco seasoning over the vegetables. Cook the vegetables, stirring a couple of times until they are slightly blackened.
Turn heat to medium-high , add the garlic and stir until fragrant, about 30 seconds. Remove the vegetables to plate.
In the same skillet, add the stock, cream*, Ro-Tel tomatoes, and uncooked macaroni. Stir to combine and turn the heat up to bring to a boil, then cover, reducing the heat to medium-low, and simmer for 15 minutes until macaroni is tender and liquid is mostly absorbed.
Add the chicken and vegetables back into the skillet and stir to combine until heated through, about 5 minutes. Serve!