Nutella Frangipane Empanadas

Name: Nutella Frangipane Empanadas
Ingredients: For the empanada dough; 170 grams all-purpose flour (1¼ cup); 20 grams corn flour/corn starch (1½ tbsp); 100 grams soft butter (1 stick minus 1 tbsp); 50 grams icing/confectioner’s sugar (1/3 cup); 40 grams ground hazelnuts (1/3 cup); 1 egg; 1 pinch salt; For the frangipane; 120 grams Nutella (½ cup); 50 grams butter (½ stick); 120 grams ground hazelnuts (1¼ cup); 2 eggs; 1 egg yolk; 1 teaspoon milk