Brown the ground beef in a medium skillet over medium heat (or use the browning setting on your slow cooker).
Drain the grease and transfer the cooked beef to your slow cooker.
Add the refried beans, 2/3 of the shredded cheese, fire-roasted green chiles, cream cheese, sour cream, and taco seasoning to the slow cooker.
Stir the ingredients together until completely combined. Use a spatula to level out the mixture for even cooking.
Wipe the edges of the slow cooker with a paper towel for a clean presentation, then sprinkle the remaining cheese on top.
Cover and cook on HIGH for 2 hours. Resist the temptation to lift the lid—it'll slow down the process!
Once melted and bubbly, serve the dip hot with chips. Add extra sour cream, olives, or salsa on top if desired.