Preheat the oven to 425 degrees F. Line two baking sheets with parchment paper
Whisk together the flour, Cheddar, Parmesan, baking powder, sugar, 1/2 teaspoon salt, a few grinds of black pepper and the scallion in a large bowl. Add the cream and the lemon juice. Stir the mixture with a wooden spoon until it just forms a dough. Gather the dough into a ball and transfer it to a flour-dusted surface. Pat it into a 1/2-inch-thick circle. Cut as many mini biscuits as you can with a 2-inch biscuit cutter. Gently press the scraps together and repeat. Arrange the rounds 1 inch apart on the prepared baking sheets. Brush the biscuits with some cream. Bake them in the middle rack of the oven until they are just golden on the bottom, about 12 minutes.
Split your biscuit in half and make a quick sandwich for packed lunches. Try ham and a slice of apple, chicken salad or a BLT version.
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