This is a great side dish and sooo very delicious. If you have any left over, just heat it up in a toaster oven or regular oven. It tastes sorta like pizza. My family really likes this savory pie. I usually make it in the summer with our fresh tomatoes right out of our own garden.
Preheat oven to 400. Bake pie shell for approximately 10-12 minutes or until golden brown then cool completely. Reduce oven to 350 after you have baked the pie shell. Wash, peel and cube tomatoes. Some people slice their tomatoes but be sure they are rather thick slices if you chose to slice them. I have done this both ways but prefer them cubed.
Sprinkle tomatoes w/salt & pepper & place between paper towels (to drain out some of the water) while the crust is cooking then pat dry as much as possible.
Place tomatoes & onions into the cooked and cooled pie shell. Sprinkle oregano over top of tomatoes & onions.
Now blend together the mayo, cheese, egg, salt, pepper, chives and garlic powder ( I also add a little more oregano). Spread over top of tomatoes/onions and sprinkle on a little basil if desired. Bake at 350 for 30 minutes or until lightly brown.
Note: You can actually mix the spices & chives in with the mayo, cheese, egg mixture then pour over the tomatoes/onions. I've done it both ways.
Optional: You can grate some fresh parmesan &/or cheddar cheese on top. You can also serve with a dollop of sour cream on top of your slice of pie (that's what I do). Also, cooked and crumbled bacon is good on this pie, too. Just play around with the spices you like and make it according to your taste. This makes one pie.