Mash or slice the banana: For a thicker, naturally sweet base, mash half a banana per jar.
For a cleaner look and a bit of texture, slice it and layer later.
Whisk the wet ingredients: In a bowl or measuring cup, whisk 1 cup milk, 2 teaspoons maple syrup (to taste), 1 teaspoon vanilla, and a small pinch of salt until smooth.
Add peanut butter: Stir in 1–2 tablespoons peanut butter. If it’s thick, warm it slightly so it blends evenly.
Stir in chia seeds: Add 3 tablespoons chia seeds. Whisk well to prevent clumps.
Let the mixture sit for 5 minutes, then whisk again.
Assemble the jars: Divide the mixture between two 10–12 oz jars. Add banana slices or the mashed banana layer, then spoon more pudding on top if you’re layering.
Chill: Cover and refrigerate at least 3–4 hours, ideally overnight, until thick and pudding-like.
Top and serve: In the morning, give it a quick stir. Add sliced banana, a drizzle of peanut butter, granola, or a sprinkle of cinnamon.
Enjoy cold.