Using a fork and bowl (or a food processors) mash or crush your raspberries.
Place your mashed raspberries in a saucepan, adding your water before bringing to a boil over medium heat, cooking 2-3 minutes to soften.
Remove the saucepan from heat.
Add your erythritol (or liquid stevia) and vanilla powder (or substitute), mixing well before adding the chia seeds.
Stir in until well-mixed before letting the mixture cool 20 minutes to thicken.
Store in the refrigerator in an air-tight container for up to 1 week.