Preheat oven to 400˚F (200˚C). Line a large baking sheet with parchment or lightly grease.
In a large bowl, combine the flour, sugar, baking powder, Meyer lemon zest, and salt.
Quickly cut in the butter using a dough blender, two forks, or your fingers until blended and no pieces are larger than a pea.
In a medium bowl, whisk together the cream, egg, lemon juice, and vanilla extract. Pour into the dry ingredients and gently combine just until the mixture comes together. Do not overmix. If the mixture continues to fall apart, add a little more cream.
Place the dough on floured surface and lightly knead to bring it together. Press into a disc about 3/4 inches (2 cm) thick and cut into 8 equal slices. Transfer to the prepared baking sheet about 1/2 inch (1.25 cm) apart. Brush the tops with cream.
Bake in the preheated oven until golden, about 12 minutes. Let cool for 5 minutes before removing to wire rack.