Prepare the Fruit Mixture: In your crockpot, combine the berries with the cranberries, granulated sugar, light brown sugar, ground allspice, ground cinnamon, and ground ginger. Stir gently to coat the fruit.

Cook the Jam: Cover the crockpot and set to cook on high for 4 hours, stirring halfway through to prevent sticking.

Blend for Consistency: After 4 hours, pulse the jam with an immersion blender for a thick, spreadable consistency.

Jar the Jam: Fill clean jars with warm jam, wipe the rims, and secure the lids lightly.

Cool and Refrigerate: Let jars cool at room temperature for about an hour, then transfer to the refrigerator.