Pre heat oven to 180c.
Combine cream cheese & sour cream, mix until smooth, then add ¼ cup parmesan cheese, chives, lemon zest & salt, mix to combine.
Add egg, harissa paste & crab & mix until just combined, then refrigerate until needed.
Melt butter, add panko crumbs & remaining parmesan cheese and mix to combine.
Lightly spray two 24 hole mini muffin tin with non-stick cooking spray.
Fill the holes with panko mixture - to about ⅔ to ¾ full.
Make an indent in the crumbs (I used the wrong end of an ice cream scoop - perfect size! or you could use your knuckle) this will create a "cup" of crumbs by compacting slightly on the base and the sides
Fill each "cup" with about 1 to 1 ½ teaspoons of crab mixture, then sprinkle the remaining panko mixture on top.
Bake for 17-18 mins, or until golden in colour & the centres feel set when pressed lightly.
Allow to cool in tins for 5 mins, these ease bites out gently using a small silicon spatula or similar.
Sprinkle with extra chives if using, then serve immediately.