Preheat oven to 350 degrees F. Place a piece of parchment onto a large casserole dish. Set aside.
Place all the ingredients except the blueberries into a food processor and puree until smooth. Pour the mixture into the prepared dish. Top with blueberries if desired.
Bake for 40-45 minutes or until cooked through and a toothpick inserted into the center comes out clean. Enjoy!