Preheat oven to 375 degrees F. Grease a 9x13-inch casserole dish.
Drain peach juice well. Place peaches on a double layer of paper towel or kitchen cloth. Blot peaches dry.
Pour cake mix in a bowl. Cut butter into cubes then add to cake mix like pie crust and blend until dough comes together and no dry cake mix remains. I used a food processor to blend the butter and cake mix.
Evenly spread dough into bottom of prepared casserole dish. Push dough until even and flat.
Evenly spread peaches on top.
In a small bowl, whisk together 2 egg yolks, 1/4 cup granulated sugar, and 16 ounces sour cream.
Spread topping over peaches. Sprinkle with cinnamon.
Bake in oven 25-40 minutes. The cake is usually done at 25-30 minutes but ovens may vary.
Allow Peach Delight Cake to cool then cut into 18 slices.