Preheat oven to 350.
Place jumbo muffin papers into the jumbo muffin tin.
Use a medium sized bowl and mix all the topping ingredients together with a fork and set aside.
Use a large bowl and mix together 1/2 cup hazelnut flour, light brown sugar, cake flour, baking powder, baking soda, cinnamon, and salt.
Add hazelnut cocoa spread, vanilla extract, and milk to dry ingredients and mix well. The standing mixer will work nicely at this stage.
Pour the batter into the 8 muffin papers.
Spread the topping (about 2 teaspoons each) on top of each muffin.
Bake until a toothpick inserted in the center comes out clean, about 20-25 minutes.
Remove muffin tin from oven and cool on a wire rack for 10 minutes, then remove muffins from the tin to continue cooling on the rack.
Serve warm with butter or cold with ice cream.