grease a 9x13 inch baking dish with butter or nonstick spray.
Assemble
in a large bowl mix peaches
granulated sugar
cornstarch
lemon juice
vanilla
cinnamon
and salt then spread evenly in the baking dish
in a separate bowl mix cake mix
oats
brown sugar
and cinnamon then drizzle in melted butter and stir until clumpy
sprinkle topping evenly over peaches and lightly press to adhere without compacting.
Bake And Serve
bake until the top is deep golden and the filling is bubbling at the edges about 40 to 50 minutes
cool 15 minutes to thicken then serve warm with ice cream or whipped cream if desired.
Notes
1. Use canned peaches 2 cans 29 oz total drained and reduce sugar to 0.5 cup; Add 0.5 tsp nutmeg or ginger for more spice; For extra crisp add 0.5 cup chopped pecans; If peaches are very juicy increase cornstarch to 3 tbsp