Peel and dice the apples into 1/2-inch cubes. In a small skillet or saucepan, combine the diced apples with 1 1/2 teaspoons cinnamon, 1 1/2 tablespoons maple syrup, and a pinch of salt. Cover and cook over low heat for 10 minutes to soften the apples and allow the cinnamon to infuse. Then uncover and cook on medium heat for 2-3 minutes until the liquid reduces slightly and the apples begin to caramelize at the edges. This creates a rich, concentrated apple filling that won't water down your oats overnight.

While the apples cook, toast the chopped walnuts in a dry skillet over medium heat for 2-3 minutes, stirring frequently, until fragrant and lightly golden. Chop them into 1/4-inch pieces if not already done. Set aside to cool slightly. I like to toast walnuts separately because it deepens their flavor and creates a pleasant textural contrast against the creamy oats—it's worth the extra minute of effort.

In a large bowl, whisk together the almond milk, 2 teaspoons chia seeds, 1 teaspoon vanilla, 1 teaspoon cinnamon, 1/4 teaspoon freshly grated nutmeg, and 1/2 tablespoon maple syrup. Let this mixture sit for a minute so the chia seeds begin to absorb the liquid. Then add 1 cup of old-fashioned rolled oats and stir until all the oats are evenly coated and moistened. The nutmeg should be freshly grated right before adding—it makes a noticeable difference in aroma compared to pre-ground.

Divide the oat base mixture from Step 3 in half. Spoon half of the oat mixture evenly into two mason jars or serving containers, filling them about one-third full. Top each jar with half of the spiced apple compote from Step 1, then divide the remaining oat mixture between the two jars. Finish each jar with a layer of the toasted walnuts from Step 2 on top, reserving a few pieces if you'd like to garnish before serving. The layering keeps the apples flavorful at the top and prevents the bottom from becoming too soggy.

Cover the jars and refrigerate overnight, or for at least 6 hours, allowing the oats to fully hydrate and the flavors to meld together. In the morning, give the oats a gentle stir and add a splash of almond milk if you prefer a thinner consistency. Serve cold or warm up in the microwave for 60-90 seconds if you prefer them hot.