Impossible Turkey Pie

Impossible Turkey Pie
2 cups diced, cooked turkey
1 4 oz can sliced mushrooms, drained
1/2 c sliced green onions, with tops
1/2 tsp salt
1 c shredded Swiss cheese (any cheese will work)
1 1/2 c milk
3/4 c buttermilk baking mix
3 eggs
Heat oven to 400. Grease pie plate with cooking spray. Layer turkey, mushrooms, onions and sprinkle with salt. Put cheese on top. In a bowl, whisk together milk, baking mix and eggs, mixing thoroughly. Carefully pour over the top of the other ingredients. Bake until golden brown and knife inserted halfway between center and edge comes out clean, 30-35 min. Let stand 5 minutes before cutting.