Preheat your oven to 425°F (220°C). Line a baking sheet with parchment paper.
In a large mixing bowl, whisk together the all-purpose flour, granulated sugar, baking soda, and salt.
Add the cold cubed butter to the dry ingredients. Use a pastry cutter, two knives, or your fingertips to cut the butter into the flour mixture until it resembles coarse crumbs.
Make a well in the center of the mixture, and pour in the buttermilk. Stir with a fork or a wooden spoon until the dough starts to come together. Avoid overmixing; you want the dough to be just combined.
Turn the dough out onto a floured surface. Gently knead the dough a few times until it forms a cohesive ball. Pat the dough into a circle about 1-inch (2.5 cm) thick.
Use a biscuit cutter or a floured drinking glass to cut out biscuits from the dough. Alternatively, you can cut the biscuits into even chunks and use your hands to shape them into balls. Gather the scraps of the dough and gently pat them together to cut more biscuits.
Place the biscuits on the prepared baking sheet, leaving a little space between each one.
Bake the biscuits in the preheated oven for about 12-15 minutes or until they are golden brown on top.
Remove the biscuits from the oven and let them cool slightly on a wire rack.
Serve these delicious biscuits warm with your favorite toppings, such as jam, honey, or vegan butter. Enjoy their flaky texture and buttery taste without the need for baking powder!