Grease a 9x13-inch baking pan and lightly dust with flour. Cream butter and sugar. Add eggs, sour cream, and almond extract, mixing well. Combine flour, baking soda, baking powder, salt, and nutmeg. Add to wet ingredients, mixing well. Spread into baking pan. Mix brown sugar, almonds, and cinnamon and sprinkle evenly over batter. Cover and chill overnight.
In the morning: Bake uncovered at 350 degrees F for 35 to 40 minutes. Cool slightly. Cut into squares and serve.