Place a large sauté pan or deep skillet over low to medium-low heat. Add the ground beef to the barely warmed pan.
Using a wooden spoon, stiff spatula, or potato masher, continuously break and press the beef into extremely fine crumbles as it cooks. Do not aggressively brown the meat; avoid large chunks or crusty browned bits. Cook for 8 to 10 minutes until the beef is fully cooked and finely broken down.
Add the minced onion and continue cooking for 5 minutes until softened and beginning to disappear into the beef.
Stir in the garlic and tomato paste. Cook for 2 minutes, stirring constantly, until the tomato paste darkens slightly and coats the meat.
Move the ground beef to make a space in the middle of the pan. Add the chili powder, paprika, cumin, salt, pepper, onion powder, and garlic powder. Cook for 1 minute to bloom the spices.
Pour in the Worcestershire sauce, yellow mustard, brown sugar, beef stock, and tomato sauce. Stir thoroughly and bring to a gentle simmer over medium-low heat.
Reduce heat to low and simmer uncovered for 35 to 45 minutes, stirring occasionally. Every 5 to 10 minutes, continue pressing and breaking the meat with a potato masher. The final texture should resemble a thick, luxurious meat sauce that pours slowly. (If it becomes too thick, loosen with a splash of warm beef stock; if too thin, stir in crushed saltines during the final 5 minutes).
Taste and adjust salt if necessary. Hold warm over the lowest possible heat until serving.