Preheat your oven to 350°F (175°C). Grease a 9×13 casserole dish.
In a mixer, whip eggs and sugar for about 5 minutes until the mix is thick, light, and almost doubled in size.
Blend in butter and vanilla, then fold in the flour gently. Stir in cranberries to distribute evenly.
Pour the batter into the prepared dish.
Bake for 45 minutes or until a toothpick comes out clean.
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