Peach Dessert

1 bag frozen peaches (2 cups sliced peaches)
1 tablespoon cornstarch
1/2 teaspoon vanilla extract
1/4 cup brown sugar
1/4 to 1/2 teaspoon cinnamon
1 Jiffy white cake mix (or 1/2 package 2-layer size cake mix)
4 tablespoons melted butter

Lightly grease the crockpot; place peaches in the bottom. Sprinkle with cornstarch; toss. Drizzle with vanilla extract and sprinkle brown sugar over all. Sprinkle with cinnamon then cake mix. Drizzle melted butter evenly over cake mix. Cover and cook on HIGH for 3 to 3 1/2 hours.