Preheat your oven to 450°F (230°C) and line a baking sheet with parchment paper.

Carefully dice your peaches and lay them on paper towels to absorb excess moisture.

In a large mixing bowl, whisk together all-purpose flour, baking powder, salt, and powdered sugar.

Grate frozen butter into the dry ingredients and mix with the butter-flavored shortening until it resembles coarse crumbs.

Fold in the prepared peaches and pour in the buttermilk until the mixture forms a soft dough.

Turn the dough onto a lightly floured surface, knead gently until smooth, then pat into a rectangle about 1 inch thick.

Fold the dough into thirds and flatten again. Repeat this process, then cut rounds with a biscuit cutter.

Place the cut biscuits on the baking sheet and refrigerate for about 20 minutes.

Brush the tops with an egg wash and bake for approximately 18 minutes until golden brown.

Once baked, brush with melted butter and drizzle with glaze made from powdered sugar, melted butter, milk, vanilla extract, and salt.