Impossible Tuna Pie
Grease a 10" x 1.5" pie plate.
In a bowl using a spoon, combine tuna, sharp cheese, cream cheese, and onion. Pour this mixture into the greased pie plate.
In a blender, beat milk, Bisquick, eggs and salt. Beat for 15 seconds on high. Pour this batter on top of the tuna mixture. Bake at 400 degrees for 35-40 minutes. Test with a knife. If inserted knife comes out clean, it is done.