Step 1

Preheat oven to 375 degrees.

Step 2

In a large mixing bowl, beat the butter, brown sugar, and sugar until light and fluffy. Beat in mashed bananas and vanilla.

Step 3

Whisk together flour, cornstarch, baking soda, baking powder, and salt in a small mixing bowl. Add to the wet ingredients and stir till just combined. Fold in the chocolate chips.

Step 4

Drop by spoonfuls onto silpat lined or lightly greased cookie sheets.

Step 5

Bake at 375° for 9-10 minutes or till lightly golden brown around the edges. Cool for 3-5 minutes on the cookie sheet, then remove to cooling racks.