Preheat oven to 400F
In a large bowl mix together peaches, vanilla, brown sugar, cinnamon, and corn starch. Once mixed well, pour into 10 inch cast iron skillet or oven safe dish and bake peaches for 10 minutes.
While peaches are baking, using the same bowl mix together brown sugar, melted butter, chopped pecans, flour, oats, cinnamon, and salt.
After 10 minutes, carefully remove peaches from oven and top with pecan crisp. Place back into the oven and bake for 22-25 minutes.
Once done baking remove from the oven and serve hot with vanilla ice cream :) Enjoy that one!