My mom has been making this for years. I'm not sure where she got the recipe but it's easy as pie and for some reason people (including Allen) love it. I prefer blackberry and when I've tried peaches I don't think it's turned out as tasty. It doesn't have the cakey topping that you sometimes find (The Salt Lick cobbler has a yellow cake topping) but to me this is the better, more traditional version.
Preheat oven to 350 degrees.
Mix together until it crumbly: 1 stick of margarine (at room temperature so it's easy to mix)
3/4 cup of sugar
1 and 1/2 cups of Bisquick
In a pyrex dish add a little bit more than one layer of berries (a bag of frozen berries will usually do it). Sprinkle the berries with 1/4 - 1/2 cup sugar and a bit of water. (If you're using frozen berries forgo the additional water.)
Cover the berries with the margarine/sugar/Bisquick mixture.