Use a hand mixer or stand mixer to beat the eggs and sugar for 5-7 minutes until thick and foamy. The batter will fold down slower off the beaters when consistency has been reached.
Add butter and vanilla. Mix for 2 minutes.
By hand, mix the flour 1 cup at a time until just combined. Don't overmix.
Stir in the cranberries until just combined.
Spread batter into prepared baking dish.
Bake at 350 degrees for 40-50 minutes or until a toothpick inserted in the center comes out clean. The top of the cake should be a nice light-brown color.
Let cool completely before serving.
Enjoy!
Recipe by Real Life Dinner at https://reallifedinner.com/cranberry-christmas-cake/