In a bowl, mix together your flour and sugar.
Now add in your melted butter, and mix it in slowly until clumps start forming in the mixture. This is what we want - crumbles!
Optional: grease the bottom of your glass baking dish with some butter
Add in your peach filling, and then evenly sprinkle your crumble mixture on top
Pop your baking dish in the oven at 350 degrees for about 20 minutes
Serve warm with ice cream on top!