Heat the milk: Heat the milk on medium heat until nearly boiling, watching carefully.
1/2 cup milk of choice
Steep: Remove from heat; add chai masala tea and steep for 4–5 minutes, then strain.
1/2 tsp chai masala
Prep chai milk mixture: Pour chai-infused milk into a bowl, top up to 1/2 cup, stir in brown sugar and salt until dissolved.
2 tsp brown sugar, 1/16 tsp salt
Mix dry ingredients: In a separate bowl or jar, mix rolled oats, chia seeds, and cinnamon.
1/2 cup rolled oats, 1 tbsp chia seeds, 1/8 tsp cinnamon
Add chai milk mixture: Pour chai milk mixture over dry ingredients and stir thoroughly.
Refrigerate overnight: Cover and refrigerate for at least 6 hours or overnight to soften and absorb flavors.
Serve.