Preheat oven to 450°F
Mix flour, baking powder, baking soda and sugar together and set aside.
Add 2 tablespoons of butter to a pot over medium heat and let it melt. Add your sage leaves to the hot butter and let the sage leaves get crispy, about 2-3 mintes.
Scoop the sage leaves out and then chop them into tiny pieces. Mix the sage leaves into the flour mixture.
Using a cheese grater, grate your cold butter into the flour mixture. Mix with a fork until ingredients are well incorporated. Then pour the buttermilk into the mixture and incorporate.
Dump the dough onto a floured surface and shape it together into a mound. Fold the dough over itself 5-7 times.
Shape the dough into a rectangle and and gently slice it into six squares.
Place the squares onto a parchment lined baking sheet. Brush the tops of the biscuits with the leftover melted butter. Bake for 13-15 minutes.