In a large skillet over medium heat, cook the ground beef, breaking it up with a spoon as it cooks, until it is browned and cooked through. Drain any excess grease
Add the can of undrained Rotel tomatoes and the cubed Velveeta cheese to the skillett with the cooked ground beef. Stir to combine.
Stir occasionally until the cheese is melted and fully combined with the beef and tomato mixture. If desired, add the red pepper flakes for a spicy kick. Stir well to distribute the pepper flakes evenly throughout the dip.
Once the cheese is completely melted and the ingredients are well combined, remove the skillet from the heat.