Heat a large, dry frying pan over high heat. Add the hazelnuts; cook, stirring frequently until light golden brown and toasted, 4-5 minutes. Chop and set aside.
Add the buttermilk, vanilla, eggs, melted butter, oats, flour, baking powder, and salt to your blender in that order. Pulse the blender 15-20 times, until the batter is fully incorporated.
Let the batter sit for 5 minutes.
Heat a little butter on a griddle or in a large frying pan set over medium heat. When the butter begins to sizzle, ladle in ⅔ cups of the pancake better, being careful not to crowd the pan.
Cook for 3 minutes, or until the tops of the pancakes look dry; flip the pancakes over, pressing down with your spatula. Cook another 1-2 minutes, or until cooked through. Transfer pancakes to a plate.
Lower the heat to low and repeat with remaining batter.
Serve topped with more raspberries, toasted hazelnuts, and honey.