Line a large baking tray with either parchment paper or a silicone mat.
Cube the butter and set it in the freezer while you prepare the rest of the ingredients. Alternatively, you could grate the butter with a cheese grater.
Whisk the dry ingredients together: 2 cups ap flour; 1/4 cup cocoa flour; 1/4 cup sugar; 1 tablespoon baking powder; 1 teaspoon cardamom; 1/4 teaspoon salt.
Whisk the wet ingredients together: 1 egg; 1/2 cup Greek yogurt; 4 tablespoons milk.
Cut the butter into the dry ingredients using a pastry cutter until it resembles pea gravel. If you don't have a pastry cutter, you can use your fingers to work the butter into the flour.
Pour the wet ingredients into the dry ingredients. Mix together until it starts to look shaggy. At this point, you can start to form the dough ball with your hands. As you form the ball, you'll notice that some of the mixture falls away. Work this into the ball as best you can.
Once you have formed the dough ball, I like to do a bit of laminating. I'll flatten the ball down, fold it over, then flatten again. Do this three times and then form it back into a ball. Slice this larger ball in half and form the two halves into smaller balls.
On your prepared pan, flatten each of the smaller dough balls into roughly six-inch disks, keeping them as circular as possible. Once you have these formed, cut the circles into six triangles. Don't worry if they are not equal pieces. Pull them apart about 1 inch so the sides will bake up nicely. If you want softer sides, you can leave the scones close together.
Stick the tray with the scones into the refrigerator for 20 minutes. Preheat the oven to 350. Once the scones have chilled for 20 minutes, bake them for 20 minutes. You won't be able to see if they are golden brown, but they won't look shiny anymore. They will have more of a matte finish to them.
While the scones are cooling down, go ahead and mix the glaze. Because I wanted to cover these scones a bit more in glaze, I made a double batch. In a small mixing bowl, mix together 1 1/2 cups powdered sugar, 2 tablespoons of heavy cream or whole milk, and 3 teaspoons of vanilla bean paste or extract. You may find that you need to add a bit more heavy cream if the glaze seems a bit thick. Don't add too much extra at once; you don't want it to be too thin. We want the glaze to pour out like honey to cover the scone and not have it fall off the scone too much. WAIT UNTIL THE SCONES ARE COMPLETELY COOLED OFF BEFORE ADDING THE GLAZE. If the scones are too hot, the glaze will melt away.
Enjoy your scones with a cup of coffee for breakfast, or just as a snack. Or some nights, even dinner. I won't judge.