| 1 cup plus 2 tablespoons butter or margarine, softened, divided |
| 2 cups packed brown sugar |
| 4 teaspoons vanilla extract, divided |
| 3 cups quick-cooking oats |
| 2 1/2 cups all-purpose flour |
| 1 1/2 teaspoons salt, divided |
| 1 can (14 ounces) sweetened condensed milk |
| 2 cups (12 ounces) semisweet chocolate chips |