Preheat your oven to 400°F (205℃). Line your baking sheet with parchment paper or a silicone mat.
Whisk the flour, sugar, baking powder, and salt in a large bowl.
Grate the frozen butter into the flour (or use a pastry cutter or two knives) until the mixture resembles coarse crumbs. Work quickly so your butter doesn't start melting.
Gently stir in your diced strawberries.
Make a well in the center of the dry ingredients and pour in the buttermilk and vanilla. Stir until barely combined; avoid overmixing.
Turn the biscuit dough out onto a floured work surface. Gently knead and roll out to about an inch thick. Cut out biscuits by pushing a biscuit cutter straight down without twisting (a floured glass also works) and place them on the prepared baking sheet.
Bake for around 15 minutes or until they're golden brown.
Take them out of the oven, cool them on a rack for about 5 minutes, and serve warm. Let them cool to room temperature if glazing them.