01 - Process toasted hazelnuts in a food processor until they form a smooth paste, scraping down the sides as needed, about 5 minutes.
02 - Add cocoa powder, powdered sugar, vanilla extract, and sea salt to the hazelnut paste and blend until fully incorporated.
03 - With the processor running, gradually drizzle in vegetable oil followed by milk, blending until mixture is smooth and glossy.
04 - Taste and adjust sweetness or seasoning if desired. Transfer spread to a clean jar and cool to room temperature before sealing. Refrigerate up to two weeks.