Preheat oven to 425°F and lightly grease a 1 & 1/2 quart baking dish

Peel and slice peaches and place in a large mixing bowl.

Add brown sugar and mix to coat evenly

In a separate bowl mix flour, oatmeal and pecans thoroughly, then add melted butter and stir to a crumbly consistency

Divide topping mixture in half and add one portion to the bowl with the peaches

Incorporate the mixture into the peaches then transfer to the greased baking dish

Sprinkle remaining topping over the peaches

Bake for 20 - 30 minutes until peaches are soft and topping is lightly browned

Let cool for several minutes after baking and serve with ice cream

Adapted from the following: http://www.food.com/recipe/easy-peach-crisp-163994