Granola bars

I was missing granola bars, but now can make my own. Following is the basic recipe, but I will be revising it I am sure....

1 can sweetened condensed milk (this is the part I may revise)
2 T melted butter
3 cups rolled oats
3 cups of other stuff (sunflower seeds, pumpkin seed, flax seed, nuts, dried fruit)

Mix well. squish into greased baking pan, bake 350 for about 20 min.
Let cool slightly before cutting into squares. Cool completely before removing from pan.
They are crumbly unless you keep them refrigerated.