Preheat oven to 350°F. Line a large baking sheet with parchment paper and set aside.

In a medium saucepan, combine the peanut butter, corn syrup, maple syrup, brown sugar and butter. Set over moderate heat and bring up to a simmer. Give it a stir and continue to cook on a low boil for 2 minutes, making sure to stir constantly. Turn off the heat and stir in the vanilla and salt.

In a large bowl, toss together the oatmeal, walnuts, and cheerios. Add in the peanut butter syrup mixture and quickly toss with a rubber spatula until evenly combined and well-coated. Transfer to the prepared baking sheet and spread out in a single layer. Bake until golden brown, about 18 to 20 minutes. Make sure to not stir the mixture at all during baking, just leave it alone. Remove from the oven and let the granola cool completely on the pan without touching. Once cooled, add in the banana chips and peanut butter chips if using and break it up into clusters with your hands. Use right away or transfer to an airtight container and keep at room temperature for up to a week.

To make the parfaits, fill small serving glasses about halfway up with yogurt. Top with the granola and fresh banana slices. Enjoy!