Place raspberries and water in a small saucepan, pop on the lid, and bring to a boil. Reduce the heat to medium and let it bubble for 10 minutes, stirring occasionally.
Remove from heat and stir in chia seeds, maple syrup, and vanilla extract. Let it sit for 10 minutes, stirring occasionally.
Fill into a mason jar, close the lid, and let it cool at room temperature. Store in the fridge for up to one week. → The jam will thicken considerably after a few hours in the refrigerator!