Pumpkin Pie Bars

1 (18 1/2 ounce) package yellow cake mix
1/2 cup melted butter
3 eggs
3 cups canned pumpkin
2/3 cup milk
1/4 cup white sugar
1 teaspoon ground cinnamon
1/4 cup butter

Preheat oven to 350 degrees F (190 degrees C).
Grease the bottom of a 9x13 inch pan.
Pour one cup of yellow cake mix into a medium size mixing bowl; set aside.
Combine remaining cake mix, 1/2 cup melted butter and 1 egg; mix well.
Press into the baking pan.
Combine pumpkin pie filling, 2 eggs and milk in a medium size mixing bowl; mix until smooth.
Pour evenly over the crust in the 9x13 inch pan.
Pour the sugar and cinnamon into the mixing bowl containing the 1 cup of yellow cake mix.
Cut in the butter until the mixture looks crumbly.
Sprinkle this mixture over the pumpkin filling.
Bake for 45-50 minutes or until a knife inserted into the bars come out clean.