The avocado gives this its silky texture, and you should not be able to taste it at all. The secret is ripeness: use avocados that give to a gentle squeeze, with no hard patches. Underripe avocado tastes grassy; very ripe avocado just tastes of chocolate.

Avocado replaces the cream and eggs of a classic mousse. Most of its fat is monounsaturated, the same kind found in olive oil, and it brings fibre too: a serving has about 5g, unusual for a dessert.
Avocado and unsweetened cocoa both contain magnesium, and cocoa contains flavanols, plant compounds studied for their effects on blood vessels. Most of them are lost when cocoa is heavily processed, so choose a natural cocoa rather than one labelled "Dutch-processed" or "alkalised" if you can.
The honest part is the calories and the sugar. Healthy fat is still fat: a serving is about 240 calories, similar to a small slice of cake. The maple syrup adds about 10g of free sugar per serving, a third of the 30g a day the NHS suggests as a limit. Riper bananas let you cut the syrup further.
Protein is low, at about 4g. For a sweet snack with more protein, try the Greek yogurt bark with berries and pistachios or the date and cacao protein balls.
For women around menopause, swapping desserts made with cream and butter for ones built on unsaturated fat is a small, easy change for heart health: see menopause and heart health.