Cinnamon Roll Overnight Oats

Ingredients: 1/2 cup rolled oats 1/2 cup milk (or a milk alternative) 1/4 cup Greek yogurt (optional, for extra creaminess) 1-2 tablespoons maple syrup or honey 1/2 teaspoon vanilla extract 1/2 teaspoon ground cinnamon A pinch of salt For the cinnamon swirl: 1 tablespoon melted butter (or coconut oil for a dairy-free version) 1 tablespoon brown sugar