Preheat the oven to 350 degrees F.
Place the diced tomatoes in a colander. Sprinkle with the onions, basil, and House Seasoning, and toss to coat. Allow to drain, stirring occasionally. Fill each phyllo shell with a scant tablespoon of the tomato mixture. Stir together the mozzarella and mayonnaise. Frost the top of each shell with a scant tablespoon of the mozzarella mixture. Sprinkle each shell with 1/4 teaspoon of bacon pieces. Bake the filled shells for 10 to 12 minutes. Serve hot. These may be prepared ahead of time and refrigerated until serving time.
House Seasoning:
1 cup salt
1/4 cup black pepper
1/4 cup garlic powder
Mix ingredients together and store in an airtight container for up to 6 months.