Set the oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a large bowl, whisk together the flour, baking powder, and salt. Add the cold, cubed butter and use a pastry cutter or your fingers to mix until the texture resembles coarse crumbs.
2 cups all-purpose flour, 1 tablespoon baking powder, ½ teaspoon salt, ½ cup unsalted butter
Stir in the shredded cheddar cheese and fresh thyme until evenly distributed.
1 cup shredded cheddar cheese, 1 tablespoon fresh thyme
Slowly pour in the buttermilk, stirring just until the dough comes together. Do not overmix.
¾ cup buttermilk
Gently press the dough into a flat disc using your hands. Cut out biscuits with a cookie cutter.
Arrange the biscuits on the prepared baking sheet and bake for 12 to 15 minutes, or until golden brown.
Brush the tops with melted butter before serving, if desired.
2 tablespoons melted butter