Creating the Sugar Raspberry Danish Bun is simple if you follow these easy steps:

1. Prepare the Dough: In a large bowl, combine the flour, granulated sugar, salt, and instant yeast.
2. Mix Wet Ingredients: In another bowl, whisk together the warm milk, melted butter, and egg until well combined.
3. Combine Mixtures: Pour the wet ingredients into the dry ingredients and mix until a dough forms.
4. Knead the Dough: Turn the dough onto a floured surface and knead for about 5 minutes until smooth and elastic.
5. First Rise: Place the dough in a greased bowl, cover with a clean cloth, and let it rise in a warm area for about 30 minutes, or until doubled in size.
6. Prepare Raspberry Filling: In a bowl, mix the raspberries, cornstarch, and vanilla extract. Set aside.
7. Roll Out Dough: Once the dough has risen, punch it down and roll it out on a floured surface into a rectangle about 1/4 inch thick.
8. Cut and Fill: Cut the dough into squares. Place a spoonful of raspberry filling in the center of each square.
9. Shape Buns: Fold the corners of each square towards the center to enclose the filling and pinch to seal.
10. Second Rise: Place the shaped buns on a baking sheet lined with parchment paper, cover, and let rise for another 15 minutes.
11. Preheat Oven: Preheat your oven to 375°F (190°C) during the second rise.
12. Egg Wash: Brush the tops of the buns with a beaten egg for a golden color.
13. Bake: Bake in the preheated oven for 20-25 minutes or until golden brown.
14. Cool: Allow the buns to cool on a wire rack for 10-15 minutes.
15. Serve: Dust with powdered sugar before serving, if desired.

These straightforward instructions will guide you to create these delightful pastries effortlessly.