Use clean 1 quart (4 cups) glass jar with lid. Stir together brown sugar and cinnamon; pack down into bottom of jar. Layer with oats, then toffee bits. Stir together flour, baking soda and salt; place as top layer. Close jar; attach card with following instructions:
1. Heat oven to 375 F. Lightly grease cookie sheet or line with parchment paper.
2. Spoon contents of jar into large bowl; break up any lumps with wooden spoon. Add 1/2 cup (1 stick) softened butter, 1 lightly beaten egg and 1 teaspoon vanilla extract; beat on low speed of mixer until well blended. Drop dough by rounded teaspoons about 2 inches apart onto prepared sheet.
3. Bake 8 to 10 minutes or until edges are lightly browned. Cool 1 minute; remove to wire rack. Makes about 36 cookies.