Step 1

Place the softened butter in a food processor or bowl of a stand mixer. Mix until the butter is very soft and at a whipped consistency.

Step 2

Add the salt (if using) and slowly drizzle in the oil with the food processor running. Once the oil is added, scrape down the sides of the bowl as needed and mix again until the mixture is a smooth consistency (it will be runny).

Step 3

Pour into large airtight container and chill completely. Store in the fridge for up to 1 month (if you think it will take you longer to use this amount of spreadable butter, pour into two smaller containers and store one in the freezer). Use as needed replace butter/margarine as a spread, or in recipes.