Heat oven to 350°F Spray 13x9-inch pan with nonstick cooking spray. Melt butter in medium saucepan over low heat. Add chocolate; cook and stir 1 to 2 minutes or until melted. Remove from heat. Stir in sugar, 1 teaspoon cinnamon and vanilla. Add 4 eggs, one at a time, beating well after each addition. Add flour; mix until smooth. Spread batter evenly in pan.
Crumble almond paste into food processor. Process until finely chopped. Add 1/4 teaspoon cinnamon and 1 egg; process until completely smooth. Drop almond mixture by small spoonfuls onto brownie batter. Swirl with knife.
Bake 30 to 35 minutes or until toothpick inserted in center comes out almost clean. Cool on wire rack.