1. To make garlic toast, spread margarine or butter on French bread or any bread you prefer. Sprinkle with garlic powder and Gruyere cheese and toast in toaster oven or oven until the bread turns brown.

2. Place the onion in a microwave-safe bowl (3 liter or 3 quart), and cover with a vented microwave lid.* Cook on HIGH (1200W) for 5 minutes. When the onion becomes tender, uncover and cook 5 more minutes to reduce the excess fluid.

3. Add the margarine and mix until it melts. Cook for 10 more minutes without covering. It tends to burn from the edges. To avoid this, take out a couple of times and stir.

4. Add the boiling water and beef bouillon, cover with a vented microwave lid and cook on HIGH (1200W) for 4 minutes or until it reaches a boil. Sprinkle salt and pepper to taste.

5. Place a garlic toast in each serving bowl, pour in the soup and sprinkle with cheese.

* If using plastic wrap as a cover, poke a hole in the center to release the steam.
* You can make <Onion Casserole> simply by baking the Onion Soup in 450F oven.

For how long you should cook with your microwave oven, see Cooking Time vs Wattage Conversion.
For more tips of using Microwave Oven, see Sachiko's Guideline to Microwave Cooking.