Mash the banana in a mixing bowl until smooth and creamy.

Add Greek yogurt to the mashed banana and whisk until well combined.

Stir in protein powder and vanilla bean powder until fully blended.

Add honey or maple syrup to taste and mix until sweetened to your liking.

Layer 1/4 of the yogurt mixture in a glass, followed by sliced bananas and crushed vanilla wafers. Repeat layers until ingredients are used up.

Chill the parfait in the refrigerator for at least 10 minutes.

Serve immediately, keeping wafer cookies separate until serving for crunch.