Preheat oven to 450°F and line a baking sheet with parchment paper.
In a large bowl, stir together the 1 cup of flour, 1 1/2 teaspoons baking powder, 1 1/2 teaspoons old bay seasoning, and 1/4 teaspoon of kosher salt. Use a box grater to grate the 4 tablespoons of butter on the largest hole, directly into the bowl. Use your fingers to toss the butter into the flour and pinch it together into a crumbly consistency.
Stir in the 1/2 cup of cheddar cheese and 1/2 cup of whole milk.
Use a cookie scoop or 1/4 cup measurer (don’t fill it all the way) to scoop biscuits onto a parchment-lined baking sheet.
Brush the tops of the biscuits with a bit of milk.
Bake for 12 to 15 minutes, until the tops are golden-brown and crisp and the insides are delicate and fluffy!