Combine shortening, brown sugar, and sugar in a mixing bowl.

Cream the mixture until light and fluffy.

Add eggs one at a time, mixing well after each addition.

Stir in vanilla extract.

In a separate bowl, whisk together flour, baking powder, and salt.

Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Fold in M&M's.

Drop by rounded tablespoons onto ungreased baking sheets.

Bake at 375°F (190°C) for 10 to 12 minutes, or until golden brown.

Let cool on baking sheets for a few minutes before transferring to a wire rack to cool completely.