Chop the onion and garlic. Chop the chicken into even-sized 1-inch pieces. Measuring out the other ingredients or bringing them out to the counter will save time.
Cook:
Heat a skillet over medium heat. Once hot, add the bacon and cook it for about 2 minutes, until it has browned on both sides. Remove it from the skillet onto a plate.
Add the oil to the skillet and cook the chicken pieces for about 3 minutes, long enough for all sides to brown. Remove them from the pan onto the plate. You'll finish cooking the chicken with the rice.
Add the chopped onions and sauté for about 3 minutes. Once they've softened, add the garlic and stir, cooking for another 30 seconds.
Add the Cajun seasoning and stir. Add the diced tomatoes with the liquid to the skillet, the white rice, and the water. Stir to combine.
Add the chicken back into the skillet and any juices from the plate, as well as the piece of bacon chopped into a few pieces, and mix everything.
Bring it to a boil, cover it with a lid, and reduce the heat to a simmer (lowest setting). Cook for 15 minutes and turn off the heat. Let it sit there covered for 5 to 10 minutes to finish cooking until the rice is soft.
Serve:
With a fork, fluff the Cajun rice in the skillet. Serve into bowls.