I made this recipe recently and it was pretty good. I had baked a turkey breast on New Years Day so I used leftover chopped turkey instead of the ground beef. I also added salsa to the top and it was very filling. When I was making it I thought that it needed more cheese but once it was made it was perfect. The recipe states to bake for 30 minutes or until center is set. It took almost an hour for the center to set for me so just keep an eye on yours while baking.
You can find the recipe here. Easy Low Carb Taco Pie