Preheat the oven to 375 degrees Fahrenheit.

In a medium size mixing bowl, stir together the flour, baking soda and salt.  Set aside.

In a separate bowl, use an electric mixer or stand up mixer to combine the butter, brown sugar, peanut butter, milk and vanilla extract.  Mix at medium speed until combined.

Then add in the egg and mix until the egg is incorporated in the batter.

Reduce the mixer speed down to low and slowly add the dry ingredients into the wet ingredients until just combined.  Be careful not to over mix the batter.

Use a cookie scoop to roll the batter into approximately 2 tablespoons size balls.  Then form each of the balls into triangle shapes.  Then place them on a baking sheet.

Bake the cookies for 8-10 minutes until the cookies are just set.

Remove the cookies and decorate them quickly while the cookies are still warm.

Use the pretzels to form the antlers at the large size of the triangles on the cookies and use the candy eyes and red M&Ms to make the reindeer faces on each of the cookies.

Let the cookies sit for 5 minutes on the baking sheets.

Carefully transfer them to wire racks to cool completely.

Then the cookies are ready to serve and enjoy!