This is my favorite 'tomato-as-a-side-dish' recipe. It adds color to your plate, great flavor, and depending on what crumbs you use, can be low-fat (low-fat cheese works well, too), and can take on a variety of flavors.
Trim ends to make the halves stand flat, if necessary.
Arrange cut side up on microwaveable plate.
Mix crumbs and herbs; mound evenly on tomatoes.
Microwave uncovered on high for 2 minutes, rotating after 1 minute.
Sprinkle cheese on top of tomatoes and either microwave 1 minute until cheese is melted, or transfer tomatoes to an appropriate pan to broil in the oven or toaster oven until the cheese is bubbly and begins to brown.