1. Preheat oven to 350 F.
2. Add cooked butternut squash, eggs, half-and-half, orange rind, lemon rind, all-purpose flour, sugar, salt and pepper to large bowl. Stir to combine.
3. Spoon squash mixture into large buttered casserole dish.
4. Place casserole dish into baking pan. Add ½” water to baking pan.
5. Bake 50 minutes until set.