Preheat your oven to 350°F (175°C). Lightly grease a 12-cup muffin tin with shortening to prevent sticking.
In a medium bowl, combine the granulated sugar with 1/2 teaspoon of ground cinnamon. Stir well to evenly distribute the cinnamon.
In a separate small bowl, combine the melted buttermilk with the remaining 1/4 teaspoon cinnamon. This mixture will add moisture and flavor to the biscuits.
Open the can of Pillsbury Grands! Blueberry Biscuits and separate each biscuit into quarters. You should have about 24 pieces total.
Dip each biscuit piece into the cinnamon-buttermilk mixture, then roll it in the cinnamon sugar mixture until fully coated.
Place a few coated biscuit pieces into each muffin cup. Sprinkle a few white chocolate chips and a pinch of brown sugar over the biscuit pieces. Continue layering biscuit pieces, chocolate chips, and brown sugar until the muffin cups are filled.
Drizzle the melted shortening evenly over the tops of the biscuit layers in each muffin cup. This helps create a golden, crispy coating.
Bake the muffin tin in the preheated oven for 20-25 minutes, or until the muffins are puffed, golden brown, and cooked through.
Allow the muffins to cool in the pan for about 5 minutes, then carefully remove each muffin and transfer to a cooling rack. Serve warm for the best gooey texture.