Preheat oven to 180 degrees C. Grease a 23x33cm baking tin.
In large bowl, mix together the cake mix, butter and 1 egg. Mixture will be crumbly. Press into the prepared tin.
In another bowl, mix together the sweetened condensed milk, vanilla and 1 egg until smooth. Stir in 1 cup of the coconut and pecans. Spread the mixture evenly over the prepared crust. Sprinkle remaining 1/4 cup coconut over top.
Bake for 30 to 35 minutes in the preheated oven or until golden brown. Cool on a wire rack before cutting into bars.