Cream butter and brown sugar until fluffy. Add vanilla. Mix dry ingredients. Add to butter/sugar mixture. Mix well. Press 1/2 of crumbs into a greased 9x9 baking pan (glass if cooking in microwave). Spread with jam. Crumble remaining mix on top. Bake at 400 degrees for 20-25 minutes. Cool. Cut into bars.
Mix as in recipe above. Put 1/2 of the crumbs into a glass 9x9 baking pan. Microwave on high for 3-4 minutes (depending on microwave strength). Spread jam on baked crumbs. Sprinkle remaining crumbs on top. Press lightly. Cook for 3 more minutes. Cool. Cut into bars