"This chili was made for school chili suppers back in the 1950's. I remember in the third and fourth grades, the teachers would have each student draw on poster board a bowl of chili and crackers. The posters were then used to advertise the coming event. This recipe comes from our neighbor who worked in the school cafeteria."
Heat a large skillet over medium-high heat. Cook and stir beef in the hot skillet until browned and crumbly, 5 to 7 minutes.
Stir onion into the beef. Season beef with chili powder and stir; add chili beans and tomatoes. Season chili with salt and pepper. Bring the chili to a simmer, reduce heat to medium-low, and cook at a simmer until thick, at least 1 hour.