Heat oven to 325 degrees. Place the butter in the bottom of a 10 inch round, 11x7 or 9x9 baking dish, and pop it in the oven so the butter can melt into liquid gold. Mix the flour, sugar, milk, cardamom and baking powder together in a medium bowl while you're waiting for the butter to melt. When the butter is liquefied, carefully pull the dish out of the oven and pour the fruit on top of the butter. Then pour the batter over the fruit evenly, and use a spoon to stir it slightly so some of the butter is incorporated (extra butter around the edges is encouraged) and the fruit is mostly coated.  This is not a perfect process, and it's not meant to be: just get everything kinda mixed up in the dish and sort of smooth, and you're good to go. Place the cobbler into the oven for 45 minutes (you want a golden top and bubbly edges) and when it's done, let it cool for about 10 minutes before you top it with ice cream and eat it all up.