*Note: To make homemade breadcrumbs, use 1- to 2-day-old bread. Cook the slices in either the microwave or the oven. In the microwave, cook for 3 minutes at a time (as power varies by microwave) until the bread is dry. In the oven, bake at 300 degrees for about 20 minutes. Place the bread in a sealable plastic bag and smash until the desired size is achieved.
Preheat the oven to 400 degrees.
Bring a pot of salted water to boil over high heat. Blanch the beans for 5 minutes, drain well in a colander, and transfer into a lightly buttered casserole dish. Pour in the cream and crumble the blue cheese evenly on the top. Melt the 2 tablespoons of butter in a saucepan over low heat, and mix together with the breadcrumbs in a small bowl. Sprinkle the breadcrumbs evenly over the top of the casserole. Bake for 15 minutes, or until browned and bubbling.
Let rest for 15 minutes before serving.