Preheat oven to 350 degrees F.

In a 9x13 baking dish, slice butter into squares and spread throughout pan.

Melt butter until entire bottom of baking dish is covered.

Pour brown sugar into bottom of pan and spread around.

Spread mandarin oranges into bottom of pan.

Toss in coconut and 1 handful of chopped pecans.

In a large bowl, mix cake mix according to instructions, adding in vanilla when mixing.

Add in additional chopped pecans.

Pour cake batter over oranges in pan and bake for 35 minutes or until cake is done all the way through.

Immediately flip cake over onto a serving dish or a piece of aluminum foil.

Enjoy!