Melt the butter in a small pot. When it bubbles, add the maple syrup, honey, and miso, whisking to combine. Stir in the vanilla and a sprinkle of sea salt. Set aside. You can make this in advance and reheat just before serving.
Make the meringue
Using an electric beater, whisk the egg whites and cream of tartar until stiff peaks form. Slowly add the sugar while whisking until glossy.
Make the batter
In another bowl, whisk the egg yolks, milk, vanilla, and sugar until pale and fluffy. Sift over the flour and baking powder, then mix briefly.
Gently fold in one-third of the meringue, then the rest in two stages, until just combined.
Cook the pancakes
Heat a non-stick pan over low heat and lightly oil it, wiping away excess with a paper towel.
Using an ice cream scoop, place 4 mounds of batter into the pan. Cover with a lid and cook for 5 minutes. Add another scoop of batter on top of each mound. Optionally drizzle a little water around the edges to create steam.
Cook for another 5–8 minutes until firm, then flip and cook for another 5–8 minutes. The timing will depend on your pan’s heat.
Serve with warm maple, honey miso butter poured generously over the pancakes.
Notes
Storage instructions
Soufflé pancakes are best eaten immediately, as they lose their airy texture when stored. If you have leftovers, store them in an airtight container in the fridge for up to 2 days.Reheat gently in a covered pan over very low heat to avoid drying them out. The butter sauce can be made in advance and stored in the fridge for up to a week—reheat before serving.