Blend the strawberries: Add strawberries, milk, vanilla, sweetener, and salt to a blender. Blend until smooth and pink.
Mix the base: In a large bowl, whisk Greek yogurt with protein powder until smooth.
Pour in the strawberry mixture and whisk until fully combined.
Add chia seeds: Stir in chia seeds until evenly distributed. Let the mixture sit for 10 minutes, then stir again to prevent clumping.
Portion: Divide into 4–6 cups or jars. Leave a little room for toppings.
Chill: Cover and refrigerate for at least 2 hours, ideally overnight, until thick and spoonable.
Top and serve: Add extra sliced strawberries, a sprinkle of granola, or a few chocolate shavings.
Enjoy cold.