Incorporate butter with a pastry blender or by hand to obtain a grainy texture.
Add milk and mix with a fork until smooth.
Add frozen vegetables and cheese cubes. Form dough into a ball and dust with flour.
Put the dough on a baking sheet lined with parchment paper, flatten into a disc shape of a least 8" to 10" (20 to 30 cm) in diameter. Cut into 8 equal slices. Separate the slices a little.
Bake in the oven for 30 minutes until a tooth pick can be inserted and removed cleanly or until golden.