Whisk the Wet Ingredients: In a bowl, whisk together 1 cup Greek yogurt, ½ cup apple sauce, ½ cup milk, 2 tablespoons honey, ½ teaspoon cinnamon, and 1 teaspoon vanilla extract until smooth.
Add the Chia Seeds: Stir in 4 tablespoons chia seeds. Whisk for 30 seconds to break up clumps. Let the mixture rest on the counter for 5 minutes, then give it one final, quick whisk before chilling. This is the secret to perfect thickness!
Chill Until Thick: Pour the mixture into serving jars or cover the bowl. Refrigerate for at least 2 hours, or ideally, overnight. The mixture is ready when it has fully thickened into a creamy pudding consistency.
Serve and Top: Before serving, stir the pudding to ensure creaminess. Top with fresh diced apples, nuts, honey, and any other desired additions. Enjoy cold!
