01 - Combine mixed berries in a medium saucepan over medium heat. Cook for 5 minutes, stirring occasionally until berries break down and release their natural juices.
02 - Use a fork or potato masher to crush berries to your preferred texture—leave slightly chunky for rustic jam or mash thoroughly for smoother consistency.
03 - Stir in maple syrup (or honey), chia seeds, vanilla extract, and lemon juice until evenly distributed throughout the fruit mixture.
04 - Remove saucepan from heat. Let mixture stand for 5 minutes, stirring occasionally as chia seeds absorb liquid and jam reaches desired thickness.
05 - Taste the jam and add additional sweetener if needed, stirring well to incorporate.
06 - Transfer jam to a clean glass jar. Cool completely to room temperature before sealing with lid and refrigerating.