Cinnamon Marzipan Brownies

I made these last week, and in one word: sinful.

1 cup butter, unsalted
4 oz unsweetened chocolate, chopped (I actually found a block of Valhrona I totally forgot about since I picked it up at Central market--woo-hoo)
1.5 cups sugar
2 tsp. vanilla
1 tsp. cinnamon
4 eggs
1 cup all-purpose flour

Filling:
1 pkg almond paste (8 oz)
1/4 tsp. cinnamon
1 egg

Heat oven to 350 F. Spray 13x9 inch pan with cooking spray and set aside.
Melt butter in medium saucepan over low heat; add chocolate pieces, remove from heat and stir together until melted. Stir in sugar, cinnamon, vanilla. Add eggs, 1 at a time, beat well after each.
Add flour; mix until smooth. Spread evenly into pan.
For filling: crumble almond paste into bowl; add egg and 1/4 tsp cinnamon; using handheld mixer or food processor, process until smooth.
Drop almond mixture by spoonfuls over brownie mix; swirl with knife.
Bake 30-35 minutes or until toothpick inserted in center comes out almost clean.
Cut into very small squares; this is dense.