Add spices and salt to a bowl and stir until well combined.
Evenly rub the pork butt with the spice rub. Cover with plastic wrap and chill in the fridge for about 1 hour.
Set a wire rack onto an aluminum foil-lined baking sheet, then set the meat on the wire rack.
Tightly cover the entire baking sheet with aluminum foil. Make sure to seal the foil well around the edges of the baking sheet.
Bake at 325 degrees F. for 5 hours. Remove from the oven and let cool for a few minutes. Carefully remove the cover foil (there will be a lot of steam underneath). Pull the meat apart using two forks.
Recipe notes:
*Chili powder is a spice blend usually made from ground chili peppers, cumin, oregano, dried garlic and salt. It's widely available in spice shops.