This is what you'll need...
Preheat oven to 350. Toss peeled and sliced peaches in 1/2 cup of sugar. You can use less sugar (but I like all the 'syrupie' goodness that comes along with more sugar). Cream butter and 1 cup sugar together. Mix in flour. Add egg and vanilla extract. Poor mixture over peaches. Bake for about 40 minutes.
*I always bake cobblers, pies and cakes on a cookie sheet because spillage happens when I don't use one...*
I have also used this same recipe with honey crisp apples and it was delicious!