Heat the oil in a saucepan over medium heat. Add the ground beef and cook, stirring, until browned and all pink has disappeared, about 5 minutes.
Add the onion, garlic, chili powder, Baby Bam, cumin, salt, and black pepper. Cook, stirring, until the onions are soft, about 4 minutes.
Add the water, tomato paste, and sugar, and stir to mix. Bring to a boil. Reduce the heat to medium-low and cook, uncovered, until most of the liquid has evaporated, about 20 minutes.
Add the beans and simmer until heated through, about 2 minutes. Remove the pan from heat.
To serve, put one cup of corn chips in each bowl. Top with equal portions of the meat mixture.
Garnish each serving with some of the cheese, tomato, and scallions.
YIELD: 4 to 6 servings