Melt the butter in the microwave in 10-second bursts.
Put the coconut and almonds in a food processor.
Pulse until the pieces look like porridge oats, with some texture left.
Tip the crumbs into a large bowl.
Add the sweetener, whey protein, baking powder, cinnamon and salt.
Stir until combined.
Add the egg, melted butter, cream and maple-flavoured syrup.
Mix until there are no dry patches.
Tip the mixture into a lined lamington tin (about 20 × 30 cm).
Bake for 20–25 minutes. The centre should still be soft and a little wobbly.
Rest in the dish for 10 minutes.
Serve with a dollop of cream.
Notes
Storage: refrigerate within 2 hours, keep at 5°C or below and eat within 3 days. Freeze portions for up to 3 months. Key swap: regular brown sugar instead of the monkfruit sweetener takes it out of keto.