Add the raspberries to a small saucepan over low heat and cook for about 5 minutes, stirring and gently mashing until they soften and become juicy.
Stir in the maple syrup, chia seeds, and lemon juice. Remove from the heat and let sit for 10 to 15 minutes to thicken.
In a medium bowl, stir together the oats, chia seeds, PB2, and sea salt.
Then add to the oat mixture the Greek yogurt, almond milk, peanut butter, vanilla, and maple syrup, if using. Mix until smooth and creamy. Add a splash more almond milk if needed for a looser consistency.
Cover and refrigerate for at least 4 hours, or overnight.
Spoon the oats into jars or bowls, then layer with the raspberry chia jam. Add optional peanut butter between layers.
Right before serving, top with raspberry yogurt whip, and peanut butter streusel if desired.