Well, I got this recipe here but then changed it a bunch. Here's my variation.
2 Roma tomatoes
Fresh basil, chopped
Parmesan cheese for the top (or Mozzarella would be fine)
4oz-ish Cheese of some sort-Blue, Feta, cream cheese, or in my case-we had nothing else but 2 Laughing Cow herb & something or other wedges and those were great.
Cut zucchini into 3/4-in. slices. Using a melon baller or small spoon, scoop out the insides and discard, leaving the bottom intact. Place zucchini on an ungreased baking sheet; spoon 1/2 teaspoon cheese into each. Combine Parmesan cheese, basil and pepper; sprinkle half over inside cheese. Top each with a tomato slice; sprinkle with remaining Parmesan mixture. Bake at 400 degrees F for 5-7 minutes or until cheese is melted. Serve warm.