Preheat the oven to 425°F (220°C). Line a baking tray with parchment paper or foil.
Stir the biscuit baking mix and shredded sharp cheddar together in a large bowl until the cheese is coated.
Add the milk and stir just until a thick dough forms. Do not overmix.
On a lightly floured surface, pat or roll the dough into a rectangle about 1/2 inch thick. Cut into narrow strips.
Place the strips on the prepared tray, leaving space between them.
Bake for 10 to 14 minutes, until puffed, cooked through and deep golden at the edges.
Let cool on the tray for a few minutes, then serve warm or at room temperature.
