Preparation In the bowl of a stand mixer fitted with the whisk attachment or in a large bowl with a handheld mixer, beat butter on medium speed until smooth and fluffy. Add vanilla paste, vanilla extract, and salt and beat until combined. Transfer to a small bowl or resealable container; cover and chill until ready to use. Preheat oven to 400°F. Arrange bread in an even layer on 2 rimmed baking sheets. Toast until bread is lightly golden brown, 4–6 minutes. Meanwhile, toss anchovies, oil, and pepper in a small bowl. While toast is still warm, spread a thick layer of vanilla butter over each. Top with an anchovy fillet and transfer to a large platter. Scatter parsley over. Do Ahead: Vanilla butter can be made 5 days ahead. Transfer to an airtight container and chill.
Preparation In the bowl of a stand mixer fitted with the whisk attachment or in a large bowl with a handheld mixer, beat butter on medium speed until smooth and fluffy. Add vanilla paste, vanilla extract, and salt and beat until combined. Transfer to a small bowl or resealable container; cover and chill until ready to use. Preheat oven to 400°F. Arrange bread in an even layer on 2 rimmed baking sheets. Toast until bread is lightly golden brown, 4–6 minutes. Meanwhile, toss anchovies, oil, and pepper in a small bowl. While toast is still warm, spread a thick layer of vanilla butter over each. Top with an anchovy fillet and transfer to a large platter. Scatter parsley over. Do Ahead: Vanilla butter can be made 5 days ahead. Transfer to an airtight container and chill.