Caramel Nut Cake in a Jar

2 cups brown sugar
2/3 cup sugar
1 cup (2 sticks) butter
4 eggs
2/3 cup milk
1 Tbsp. vanilla
3 1/2 cups flour
1 tsp. baking powder
2 tsp. baking soda
1 tsp. salt
1 cup chopped nuts

In large bowl cream sugars and butter with electric mixer. Add eggs and mix well. Add milk and vanilla and mix well. Place dry ingredients and spices in a separate large bowl and blend with a whisk. Add creamed ingredients to dry ingredients and mix with whisk and spoon. Gently stir in nuts. Place 1 cup batter each into 6 well-greased 1-pint wide-mouth canning jars. Wipe batter from rim.Place jars on a baking sheet. Bake at 325 degrees F for 50 minutes, or until a toothpick inserted in center comes out clean. Wipe rims. Place hot sterilized seals and rings on hot jars. Keep in refrigerator for prolonged storage.