Preheat the oven to 350F.
Heat a pan over medium high heat, and add the beef.
Cook for 8-10 minutes, stirring occasionally and breaking it up with a spatula or wooden spoon.
Drop the heat to medium, add the onions and bell peppers,and cook for another 5-8 minutes until the vegetables are cooked, and the liquid has evaporated.
Add the seasonings and cream cheese, and stir until combined.
Transfer the mixture to a stoneware baking dish ( we used 12.5” x9.5 “) .
Arrange the cheese slices on top, and bake for 10-15 minutes until the cheese is melted and golden around the edges.
Let it cool for 10 minutes before cutting into and serving .
Serve on its own, or on lettuce cups.