Preheat oven to 350º. Grease a 9x13 pan with vegetable shortening.

In a large bowl, add softened butter and sugars. Beat until fluffy.

Add egg and vanilla to the sugar mixture and beat until combined.

In a medium bowl, add flour, baking soda, salt, and cinnamon.

Gradually beat in dry ingredients to wet ingredients.

Fold in chocolate chips and chopped pecans.

Press cookie dough into the bottom of the prepared pan.

Bake for 25 minutes or until edges of the cookie are golden brown and a toothpick comes out clean from the center.

Allow cookie to cool. Then, cut the cookie right down the middle.

Spread ice cream over one half, then top with the other.

Place back into the freezer for at least 30 minutes. Then, cut into bars.

Serve immediately or wrap sandwiches and freeze.