Note: Precut onions and peppers, available in the refrigerated section of the produce areas, are real timesavers. You can also find frozen versions in the frozen foods section.
1. Place a large skillet over medium heat; when it's hot, add oil. Add onions, peppers, and garlic and cook, stirring often, until they've soften and darkened, about 10 minutes. Be careful not to let garlic burn. It pan gets too dry, add water.
2. Add ground beef and chili powder and cook, breaking up beef with a spoon, until it's no longer raw, about 10 minutes. (Filling may be made up to two days in advance and reheated.) While mixture is cooking, toast hamburger buns.
3. Place bottom halves of buns onto four plates. Ladle a quarter of the filling onto each bun, add top halves, and serve immediately.
Source: Hannaford fresh Magazine, July - August 2008