Cream cheese chocolate cupcakes

I made this recipe recently and thought I'd share. I'm not a huge frosting fan, and I do love easy recipes, so this is the perfect rich and decadent cupcake to make, in my mind.

Filling:
1 package (8 oz.) cream cheese, softened
1/3 c. sugar
1 egg
1/8 tsp. salt
1 c. chocolate chips
1 c. peanut butter chips (or just use more chocolate if you want)

Cupcakes:
1 1/2 c. all-purpose flour
1 c. sugar
1/4 c. baking cocoa
1 tsp. baking soda
1/2 tsp. salt
1 c. water
1/3 c. vegetable oil
1 Tbs. white vinegar
1 tsp. vanilla

In a bowl, beat cream cheese. Add sugar, egg, salt. Mix well. Fold in chips. Set aside. For cupcakes, combine flour, sugar, cocoa, baking soda, and salt. Add water, oil, vinegar, and vanilla. Mix well. Fill paper-lined muffin cups half full with batter. Top each with 2 Tbs. of cream cheese mixture. Bake at 350º for 25-30 minutes. Cool 10 minutes and remove from pan. Makes 18.

(Recipe copied from some cookbook at my mom's house a long time ago.)