Preheat the oven to 350°F (175°C).
In a medium bowl, whisk together the flour, baking powder, and salt.
In a separate large bowl, beat the softened butter until creamy. Add the milk and vanilla extract and mix until combined.
Gradually add the dry ingredients to the wet ingredients and mix until a dough forms.
On a lightly floured surface, roll the dough out to about ¼-inch thickness.
In a small bowl, mix together the granulated sugar and ground cinnamon.
Use a pizza cutter or sharp knife to cut the dough into small squares or rectangles.
Carefully transfer the dough pieces to a parchment-lined baking sheet, spacing them apart.
Sprinkle the cinnamon-sugar mixture evenly over the dough pieces.
Bake for 12-15 minutes, or until the cereal is lightly golden brown.
Allow the cereal to cool completely on the baking sheet before serving.
