Brown the Beef: In a skillet over medium heat, cook the ground beef until browned. Drain any excess fat. Stir in the minced garlic and cook for 1–2 minutes until fragrant.
Season the Meat: Add the taco seasoning packet to the beef mixture, along with 2–3 tablespoons of water, stirring until well combined.
Layer in the Crock Pot: Lightly grease the inside of your slow cooker. Spread half of the frozen diced potatoes evenly at the bottom. Top with half of the seasoned beef mixture, half of the Velveeta cubes, and half of the shredded cheese.
Repeat Layers: Add the remaining potatoes, beef, Velveeta, and shredded cheese.
Cook: Cover and cook on low for 4–5 hours or high for 2–3 hours, until the potatoes are tender and the cheese is fully melted and bubbly.
Serve: Stir lightly before serving to mix the melted cheese throughout. Serve warm with toppings like sour cream, salsa, green onions, or jalapeños.