Here's a cookie recipe that I haven't tried on the bike (my rides aren't that long) but I almost always take when I hike. My roommate calls them the "bomb cookies" because she thought they looked like an explosion of all kinds of good stuff.

16-oz. jar of natural peanut butter
3/4-1 cup H2O
2 cups white sugar
2 cups brown sugar
4 eggs
2 tsp. vanilla
2 tsp. baking soda
1 tsp. salt
2 tsp. baking powder
5 cups whole wheat flour
5-6 cups old-fashioned oats (I have always used 5 cups)
1 12-oz. bag of chocolate chips
1 cup raisins or other small pieces of dried fruit
1-2 cups nuts (I usually use sunflower seeds)

Preheat oven to 400 degrees F. Cream peanut butter, sugars, water, eggs and vanilla. Add baking soda, baking powder, salt and flour; mix. Fold in oats, nuts, fruit and chocolate chips (may have to use hands for this part). Drop by tablespoonful on cookie sheets. Bake for 10-11 minutes. Makes about 4 dozen.

This is an adaptation of a recipe I found in a family cookbook; it originally called for butter but I experimented and figured out that peanut butter could be substituted if some water was added to get the consistency right. The recipe also called for some butterscotch chips, but these tend to have a lot of trans fat and other crud in them so I substituted the fruit (that wasn't in the original recipe).