Preheat your oven to 400°F (205℃). Line your baking sheet with a couple of sheets of parchment paper, a silicone mat, or both.
In a large bowl, whisk the flour, baking powder, sugar, and salt.
Grate butter into the flour (or use a pastry cutter or two knives to cut the frozen butter into the dry ingredients until the mixture resembles coarse crumbs). Be sure to work quickly to keep the butter from melting.
Gently stir in the diced strawberries.
Make a well in the center of the flour mixture and pour the buttermilk and vanilla. Stir until just combined; avoid overmixing.
Turn the dough out onto a floured surface. Gently knead and roll out to about 1-inch thickness. Cut out biscuits with a biscuit cutter or floured glass and place them on the prepared baking sheet. (Note: Push straight down without twisting to ensure biscuits can rise properly.)
Bake for about 15 minutes or until they're golden brown.
Remove them from the oven, let them cool on a wire rack for 5 minutes or so, and serve warm. If you plan on glazing them, let them cool before proceeding.