Preheat the oven to 350 F. 

Grease a large skillet or 9x13 casserole dish or small ramekins and set aside. 

Spread out the strawberries evenly into your dish or ramekins. Sprinkle evenly with sugar and cinnamon and mix together. If you're using ramekins, mix the strawberry sugar mixture before hand and then distribute evenly. 

Sprinkle the yellow cake mix over the strawberries evenly. 

Dollop cake mixture evenly with cubed butter.

Bake for 45-60 minutes or until the sides are bubbling and the top is golden brown.