Chocolate Truffle Cookies

I've been wanting to make these for a while, but we never ever have sour cream (I find it completely disgusting, unless it's baked into something), but I actually remembered to buy some last night when we went to the store, soooo I made some :)
They were sooo good. I was lazy and didn't roll them in cocoa powder or powdered sugar, but next time I will chill them until they're firm enough to roll into balls, and then roll them in cocoa powder/powdered sugar.
They have a really great texture, and they're very rich, I think partially from all the butter, but also from the sour cream. They were very chocolate-y and sweet because I used milk chocolate chips, but not too sweet. I will definitely be making these again :)

Chocolate Truffle Cookies
Adapted from Baking Bites

1 1/4 cups butter, room temperature
2 cups confectioners’ sugar
1/3 cup unsweetened cocoa powder
1/4 cup malted milk powder
1/4 tsp salt
1/3 cup sour cream
1 1/2 tsp vanilla extract
2 1/4 cups all purpose flour
2 cups milk chocolate chips

Preheat oven to 325 and line cookie sheets with parchment paper.
Cream butter, stir in sugar, then beat using a mixer (so that powdered sugar doesn't fly everywhere when you're trying to mix it in). Sift in cocoa powder, malt and salt, mix until fully incorporated. Beat in vanilla and sour cream.
With the mixer on low, slowly add in flour until fully incorporated. Stir in chocolate chips. Roll into balls (I just used a spoon and my finger and put the dough on the cookie sheets that way), and place on cookie sheets. They don't spread much.
Bake for about 9 minutes, until barely set. Cool on sheet for 5 minutes before transferring to a wire rack to cool completely.