Botched Peach Cobbler

EEEKK!!! I messed up this recipe because I didn't read everything and rushed myself. It still tasted good enough to eat. The recipe is below from allrecipes.com. Can you guess what I messed up? I covered it in whipped cream to hide my mistake. :)  I've never made a peach cobbler before so I was disappointed that I didn't get it right. So, I'm going to try it again soon...I hope.

Southern Peach Cobbler

1/2 cup butter 

1 cup white sugar 

3/4 cup self-rising flour 

3/4 cup milk
1 (29 ounce) can sliced peaches in light syrup

Preheat oven to 350 degrees F (175 degrees C). Place butter in a deep 2 quart baking dish and place in oven to melt. In a medium bowl, mix sugar and flour. Stir in milk, a little at a time, until wholly incorporated. Pour carefully over melted butter in dish. Spoon peaches and syrup over batter. Bake in preheated oven 35 to 45 minutes, until crust is puffed and golden.