Heat the oven to: 180/160c Fan Oven/350f/Gas Mark 4.
Prepare a baking sheet/tray with baking/parchment paper on top.
Spread the almonds evenly on the tray, in one layer (see Photo 1 above), and bake for 15 minutes. Half-way through you can turn the baking sheet/tray around for even baking and even turn the almonds with a spatula. See Photo 2.
Add the butter, salt & smoked paprika to a medium bowl & mix together. (See Photo 3 below). Remove the almonds from the oven after 15 minutes and place on top of a cooling rack. (Photo 2 above).
Pour the roasted nuts into this bowl, on top of the ingredients, immediately upon taking out of the oven. Mix well with a spoon, pushing down on the butter to help it to melt and allow the nuts to be coated well. If you cut the butter into small cubes this will make the process go quicker. See Photo 4.
Pour the coated almonds back on the same baking sheet/tray and spread out as before. Scrape any left over seasoning from the bowl, on to the top of the almonds. See Photo 5.
Pop back in the oven for 5 minutes and then using a spatula, try to turn and move the nuts as best you can, before returning to the oven for a further 3 – 5 minutes. Check them after 3 minutes in case your oven is running hot. You don't want to over-cook and burn them. See Photo 6 below.
Allow to cool in the tray, on a cooling rack. After 5 minutes or so, once a little cooler, you can taste test and add more salt or sea salt to your own taste. Leave for a further 50 minutes or so, for the seasoning to set up more. Then place in a jar or airtight container and these will last at least 3 days. See Photo 7. Note too, that with time the flavour will develop more too.