Peel the banana and cut it into quarters lengthwise, so you have long flat spears.
Melt the butter in a nonstick pan over medium-high heat.
Add in the banana quarters, flat side down.
Add the almonds and shake the pan gently to coat them in butter.
Cook the bananas for 3 minutes on each side until golden brown and caramelized. The bananas will be soft so take care not to break them too much.
Remove the bananas from the pan and plate them. Pour the toasted almonds over the top of the bananas.
Top the bananas with yogurt and raspberries. Sprinkle with powdered sugar if desired.