Step 1

Preheat oven to 350° F.

Step 2

Place butter in large (1 gallon) resealable, heavy-duty plastic bag; seal. Squeeze with hands 1 minute. Open bag; add sugar and vanilla extract. Reseal; squeeze and knead until ingredients are well mixed. Open bag; add oats, flour, and morsels. Reseal; squeeze and knead until ingredients are well mixed. Open bag; scrape dough together with rubber spatula.

Step 3

Pinch off pieces of dough; roll into 1-inch balls. Place balls about 2 inches apart on ungreased cookie sheets. Dip bottom of plastic glass into granulated sugar; flatten dough balls to about 1/4-inch thickness.

Step 4

Bake cookies 13 to 15 minutes or until bottoms are light golden brown (tops of cookies will be pale). Cool 1 minute on cookie sheets; remove to wire racks. Cool completely. Store tightly covered.