Impossible Gluten Free Taco Pie ~gluten free

This was a real hit when I made it tonight!

1 lb ground beef
1 onion, diced
3 tablespoons gf taco seasoning (see Spice Mixes, condiments, fritter batters, etc.Forum for recipe)
1 cup milk
4 eggs
1/4 cup corn flour (not corn starch. It's yellow corn flour)
1/4 cup fine white cornmeal (or rice flour)
1/4 cup potato starch
1 green pepper diced
2 tomatoes, sliced
1 generous cup shredded cheddar or mozzarella cheese
1 cup canned corn (optional)
Heat oven to 400 F
Brown ground beef and onion in frying pan. Stir in taco seasoning and green pepper and corn if used.
Put in a lightly greased 10" deep pie plate
Beat milk, eggs and flours together, until smooth
Pour over meat mixture.
Bake for 25 minutes.
Arrange fresh tomato slices on top of meat. Sprinkle on cheese. Return to oven and bake an additional 5 - 8 minutes until cheese is melted.
Let cool for a couple of minutes. Slice and serve.
Serves 6