01 - Combine berries in a medium saucepan over medium heat. Cook for 5 minutes, stirring occasionally, until fruit breaks down and releases natural juices.
02 - Use fork or potato masher to crush berries to desired texture, whether chunky or completely smooth.
03 - Stir in maple syrup, chia seeds, vanilla extract, and lemon juice until evenly distributed throughout the mixture.
04 - Remove from heat. Let stand 5 minutes, stirring occasionally as chia seeds absorb liquid and jam reaches spreadable consistency.
05 - Taste jam and add additional sweetener if needed for preferred sweetness level.
06 - Transfer to clean jar. Cool completely before sealing. Refrigerate up to 1 week.