Preheat oven to 350 degrees. Spray a 9 X 13 casserole with non stick spray.
Cut tips off of a head of broccoli; steam over boiling water for about 12 minutes, just until it starts to soften and color is bright green. Arrange over the bottom of the greased casserole dish.
Using a cheese slicer, slice long thin strips of Velveeta and place over the broccoli. Sprinkle crushed Townhouse crackers over the top of the casserole.
Melt 1 stick of butter and pour evenly over the top of the cracker crumbs. Bake at 350 degrees 20 minutes, until cheese is melted and cracker crumbs are toasted.
Can be made up to a day ahead and stored in the refrigerator. If you do that, top with crackers and butter right before putting it in the oven.In my experience frozen broccoli florets do not work well in this recipe, so invest the few minutes it takes to cut them fresh.