1. Spray the inside of your crockpot (mine is 6 quarts) with cooking spary. In a medium sized bowl, combine the pumpkin puree, evaporated milk, eggs, white sugar, brown sugar, pumpkin pie spice, cinnamon, and vanilla extract.
2. Mix the melted butter and the cake mix together in a bowl until crumbly and doughy, then sprinkle evenly over the top of the pumpkin mixture. Sprinkle the chopped pecans over the top.
3. Place lid on the crockpot and cook over high heat for 2 hours, or on low heat for 4 hours. Serve warm with vanilla ice cream or whipped cream on top. Enjoy!