1. Spray 2 quart casserole dish with nonstick spray. Heat oven to 350 degrees.
2. Mix together the sweet potatoes, sugar, vanilla, eggs and cream. Spread in the casserole dish.
3. With a pastry cutter, cut together the butter, brown sugar and flour until crumbly. Mix in the pecans and sprinkle over the potatoes. Bake for 30 minutes.