Combine 1/2 cup milk, 1 tablespoon peanut butter and 2 teaspoons maple syrup in a mason jar or bowl; shake or whisk until blended. Stir in 1/2 cup oats, a pinch of salt and 1 tablespoon chocolate chips. Using a separate mason jar or bowl for each serving, repeat with the remaining ingredients. Cover and refrigerate overnight. Before serving, slice half a banana into each serving.