In a deep bowl, beat together butter and sugars until creamy.
Add egg and vanilla extract then beat well.
Add the pudding and beat.
In a separate bowl, combine flour, salt and baking soda.
Add the dry ingredients to the butter mixture and mix well.
Stir in the sprinkles and the M&M.
Cover and refrigerate for 30 minutes.
Preheat oven to 350F.
Line a baking sheet with a baking mat or parchment paper.
Scoop about 2 Tablespoons if the cookie into rounded Balla and place 2” apart.
Bake for 12-13 minutes or until edges start to brown.
Cool cookies on the baking sheet and transfer them to a cooling rack to cool completely.
Leftovers should be stored in an airtight container preferably in fridge or freezer.