Preheat the oven to 400°F (200°C). Line a baking sheet with parchment paper.

In a large bowl, whisk together the all-purpose flour, protein powder, baking powder, salt, and pepper until evenly combined.

In a separate bowl, whisk the milk, plain Greek yogurt, and melted butter until smooth.

Pour the wet mixture into the dry ingredients. Stir gently with a spatula or wooden spoon until the dough just comes together. Stop when you still see a few streaks of flour.

Fold in the shredded cheese and any optional herbs or spices until distributed.

Using a spoon or an ice cream scoop, drop mounds of dough onto the prepared baking sheet, spacing them about 2 inches apart.

Bake for 12 to 15 minutes, until the tops are golden and a toothpick inserted into the center comes out clean.

Let the biscuits cool on the baking sheet for a few minutes, then transfer to a cooling rack. Serve warm or store as directed.