Step 1

Preheat oven to 300°F. Line two large baking sheets with parchment paper; set aside.

Step 2

In a large mixing bowl, beat the butter and sugar until light and fluffy. Combine the vanilla with the baking soda and add to the butter/sugar mixture. Stir in the flour 1 cup at a time. Gently stire in the Rice Krispies. Do not over mix.

Step 3

Scoop 2-tablepoon sized mounds onto prepared baking sheets, making sure to space them at least 2 inches apart. Bake 15 minutes. Remove from oven and quickly but gently flatten with a spatula. Return to oven (rotating pans front to back, top to bottom) and bake an additional 25 minutes, until lightly golden and cracked on top.

Step 4

Remove from oven and let cool on baking sheet 8 minutes before transferring to wire rack to cool completely.