In a large mixing bowl, combine the Greek yogurt, peanut butter, honey (or maple syrup), and vanilla extract. Mix until smooth and creamy with a whisk or hand mixer.

Add the chocolate protein powder, cocoa powder, and a pinch of salt. Begin mixing slowly to prevent the dry ingredients from spilling, then increase the speed until everything is well combined.

Add the milk one tablespoon at a time while continuing to mix until the mousse reaches a thick, silky consistency. The mousse should be smooth enough to scoop easily while still holding its shape.

Continue mixing for another minute to create a lighter, fluffier texture and to remove any remaining lumps from the protein powder.

Taste the mousse and adjust the sweetness or chocolate intensity if needed by adding a little more honey, maple syrup, or cocoa powder.

Divide the mousse evenly into four serving glasses, ramekins, or airtight meal prep containers.

Cover and refrigerate for at least one hour so the mousse thickens and the flavors develop fully.

Just before serving, garnish with your favorite toppings such as fresh berries, chopped peanuts, chocolate shavings, chia seeds, or hemp hearts.

Enjoy immediately, or store covered in the refrigerator for up to four days for a convenient high-protein snack or dessert.