Step 1

Preheat the oven to 400 degrees Fahrenheit. Line a large baking sheet with parchment paper.

Step 2

In a large bowl, combine flour, sugar, baking powder, baking soda, cinnamon, and salt.

Step 3

Cut in vegetable shortening using a pastry blender or a fork until the mixture is crumbly.

Step 4

Stir in raisins and buttermilk, stirring until dry ingredients are moistened. If the dough seems too dry, add a splash of buttermilk until it reaches a good consistency.

Step 5

Turn the dough out onto a lightly floured surface. Roll the dough to about 3/4-inch thickness.

Step 6

Cut dough with a 3-inch biscuit cutter or a mini biscuit cutter. Place the biscuits on the baking sheet. Make sure not to twist the biscuit cutter as you cut them.

Step 7

Bake for about 10-15 minutes for 3-inch biscuits or for about 6-8 minutes for mini biscuits. Note: these biscuits will naturally look darker than regular ones due to the cinnamon.

Step 8

Combine powdered sugar, milk, vegetable oil (if using), and cinnamon (if using) in a small bowl. Stir until completely mixed.

Step 9

Drizzle the glaze over hot biscuits or dip the tops of the biscuits in the glaze. For a thicker coating, go around a second time.