Preheat oven to 350 degrees. Melt butter in a very large microwave safe bowl. Set aside.
Add bacon and leek to melted butter. Beat in egg. Mix in bread and cheese. Add cream just until mixture is lightly moistened, but try not to saturate the bread (you don't want a mushy mixture).
Pour into greased casserole dish and bake for 30 minutes, until the bread begins to brown on top. Serve warm and enjoy!