In an 8- to 12-ounce jar, combine the milk, yogurt, maple syrup, and chia seeds. Stir in the oats, making sure they are all submerged in the milk. Cover and refrigerate for at least 4 hours or up to 3 days.
Serve chilled, topped with fresh berries.
Stir the peanut butter into the Overnight Oat mixture until well distributed but not completely combined. Spoon the preserves on top of the mixture. Cover and refrigerate for at least 4 hours or up to 3 days.
Serve chilled, topped with chopped roasted peanuts.
Stir the pineapple into the Overnight Oat mixture made with coconut milk. Cover and refrigerate for at least 4 hours or up to 3 days.
Serve chilled, topped with toasted coconut chips.
Stir the pumpkin puree and pumpkin pie spice into the Overnight Oat mixture made without the yogurt. Cover and refrigerate for at least 4 hours or up to 3 days.
Serve chilled, topped with yogurt and more pie spice.
Spoon the mango on top of the Overnight Oat mixture made with coconut milk. Drizzle the top of the mixture with sweetened condensed milk. Cover and refrigerate for at least 4 hours or up to 3 days.
Serve chilled, topped with toasted sesame seeds.
