Peach Upside Down Cake

2 lbs. peaches
1/2 cup light brown sugar
13 tbsp. room temperature butter
2 1/4 cups flour
1 1/2 tsp. baking soda
1/4 tsp. salt
1/2 tsp. cinnamon
1/2 tsp. ground ginger
1/4 tsp. ground nutmeg
1 cup sugar
1 egg
1 tsp. vanilla
1 1/2 cups sour cream 

Heat oven to 350 F.  Peel and halve peaches. Cook brown sugar in 5 tbsp. Butter in 10 inch oven proof pan until dissolved. Off the heat arrange peach halves, cut sides up in pan. Combine flour, baking soda, salt and spices. Beat 8 tbsp. Butter with granulated sugar. Beat in egg and vanilla. Stir in flour mixture by thirds, alternating with sour cream. Spread over peaches and bake until toothpick inserted in center comes our clean, 50 to 55 minutes.