Preheat oven to 400 degrees. In a shallow 8" square baking dish,place oil and butter. Place dish in oven to melt butter. In a large bowl, beat eggs lightly; stir in grated cheese, chopped onion, dried tarragon, salt and pepper. Remove dish from oven; stir to coat evenly in oil mixture. Pour egg mixture and place tomato slices on top evenly. Bake until eggs are just set, around 15 minutes and serve. 5 servings
1
tablespoon