Streusel-Filled Spice Cake
["1/3 c. butter, melted", "1 c. brown sugar", "1 c. chopped nuts (pecans)", "1/2 c. flour", "4 tsp. cinnamon"]
["Stir together streusel ingredients until crumbly.", "Cool. Prepare cake."]
["butter", "brown sugar", "nuts", "flour", "cinnamon"]