Fat. The answer is fat.

You don't have to eat more, you just have to eat more calories. Fat is the most calorie dense choice.

Breakfast: 2 egg mcmuffins without the mcmuffin

In the readers recipe section under breakfast, there is a recipe for Mock-muffins that can be prepared in advance and eaten on the go. There is also a recipe for Meatza in Karen's recipes - pizza toppings on a meat crust that is great cold for breakfast. Add extra cheese to both to boost those calories. Take a moment to check out the breakfast section for other recipes. Most are good cold

Lunch: green salad with ranch & about 3/4 cup of chicken salad

Put extra mayo in the chicken salad, and an olive oil dressing will have more fat.

Dinner: 3 grilled chicken thighs/salad with ranch

Make a dipping sauce for the chicken out of mayonnaise, sour cream or a combination of both. Blue cheese dressing is great with chicken. And use an oil dressing on the salad, as above.

These to links will give you the lowdown on fat:

Fat and Keeping Calories Up

More on Fat and Keeping Calories Up

Karen