Pour off all but 2 teaspoons bacon drippings from skillet. Add onion and diced chiles to drippings; sauté over medium heat about 2 minutes. Add beef; cook 8 to 10 minutes, stirring occasionally, until browned and thoroughly cooked. Add chili powder and dash salt; stir to combine. Stir in tomatoes. Heat to a simmer. Taste sauce for salt; add more if needed. Cover; simmer 15 minutes longer. Remove from heat.