Preheat the oven to 350ºF. Put the jellied cranberry sauce in a bowl and break it up with a spoon. Stir in 1 1/2 cups of cranberries. Spread the mixture in a greased 9x13-inch pan.
Dump the cake mix over the cranberry mixture and spread it out so that it covers it. Sprinkle with 1 teaspoon of ground cinnamon.
Drizzle the melted butter over the top. You can tilt the pan slightly so that the butter covers most of the dry cake mix. Top 1/2 cup of cranberries and press them slightly into the cake mix.
Bake at 350˚F for 50-55 minutes.
Video
Notes
Allow leftovers to cool. Cover and store in the fridge for up to 4 days. To freeze, cover the pan with plastic wrap and foil. Store in the freezer for up to 3 months. Thaw overnight in the fridge. Reheat in the oven at 350˚F for 15 minutes.