Preheat the oven to 350 degrees. Grease a 8 x 12-inch baking dish.
Cook the ground beef in a 12-inch skillet over medium heat, crumbling the meat as it cooks, until it is browned. Drain the fat, if necessary.
Add the taco seasoning, Rotel, sour cream and 1 cup of cheese to the ground beef. Stir until well blended.
Spread the dip evenly in the greased baking dish. Top with remaining cup of cheese. Bake for 20 minutes, until the cheese is melted and the dip is bubbling around the edges.