Peanut Brittle

In 1 1/2 quart casserole, stir sugar and syrup together. Heat 5 to 6 minutes in small microwave. Stir in peanuts. Heat for 4 to 5 minutes, stirring after 2 or 2 1/2 minutes. Add butter and vanilla to syrup, blending well. Heat for 2 or 3 minutes. Peanuts will be slightly browned and syrup very hot. Add soda and stir gently until light and foamy. Pour mixture onto lightly buttered cookie sheet. Cool for 1 hour. When cool, break in to small pieces and store in airtight container. Ziploc bag is the best to store the candy in.