Heat a small skillet over medium heat. Add coconut oil, maple syrup, and cinnamon. Stir until combined.
Add the sliced banana to the skillet. Cook for 2–3 minutes per side until golden brown and caramelized.
Remove bananas from the skillet and add chopped walnuts. Toast for about 1 minute until fragrant.
In a bowl, stir together the Greek yogurt and vanilla protein powder until smooth and creamy.
Pour the yogurt mixture into a serving bowl. Top with warm caramelized bananas, toasted walnuts, peanut butter drizzle, and flaky sea salt if desired.
Serve immediately and enjoy your caramelized banana yogurt bowl warm and fresh.