Oopsie bread - A bread without carbs. OMG this is awesome. Make these and you won't crave bread. Another pinner says-"I've been eating these for over a week now instead of bread - it really works. I've lost 6 pounds in one week :) by eliminating carbs."
Marinate tomatoes in balsamic vinegar for 30 minutes. Lay on a baking sheet, season with salt and pepper. Bake for 7 minutes at 350 degrees. Then top with sautéed spinach and mozzarella. Broil until cheese melts.