Prep banana milk mixture: Warm milk in a small pot on medium until nearly boiling, add mashed banana, cook 5 minutes stirring occasionally, then remove from heat.
6 tbsp milk of choice, 1/2 small banana
Add chocolate: Add milk chocolate to warm mixture, let sit 1 minute, stir until fully melted and smooth.
1 tbsp milk chocolate
Season: Stir in cinnamon and pinch of salt, mix well, and let cool to warm temperature.
1/8 tsp cinnamon, pinch salt
Add Greek yogurt: Add Greek yogurt and stir quickly to combine.
1/3 cup Greek yogurt
Add chia seeds: Stir in chia seeds thoroughly to distribute evenly.
1 1/2 tbsp chia seeds
Cover and chill: Cover and refrigerate for at least 3 hours to thicken and develop flavor.
Serve: Once chilled and thickened, stir again and serve.
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Notes
Nutrition information calculated using skim milk, standard non-fat Greek yogurt, and typical milk chocolate. Treat it as an estimate.