Preheat oven to 350 degrees Fahrenheit. In a mixer, beat the eggs with the sugar until slightly thickened and light in color, about 5-7 minutes. The mixture should almost double in size. This mixture should form a ribbon when you lift the beaters out of the bowl.
Add the butter and vanilla; mix for two more minutes. Stir in the flour until just combined. Add the cranberries and stir to mix throughout.
Spread the batter in a buttered 9x13 inch pan. Bake for 40-50 minutes, or until very lightly browned and a toothpick inserted near the center of the cake comes out clean.
Let the cake cool completely before cutting into small slices. Enjoy!
Notes
This cake is wonderful served on its own or with a dusting of powdered sugar. It's also excellent for holiday gatherings.