Molten Lava Cookies

Preheat oven to 350°F (175°C). Cream together butter and sugar with an electric mixer. Add cocoa powder, eggs and vanilla; mix until combined.

Combine flour and baking powder in a separate bowl. Gradually add to butter mixture.

Shape dough into 1-inch balls. Using your thumb, press a thumbprint into the center; fill with a piece of chocolate and fold dough over to cover chocolate.

Place balls 2 inches apart on baking sheets lined with parchment paper.

Bake 9 to 11 minutes or until edges are firm and tops are soft. Remove cookies to a cooling rack; dust with powdered sugar, if desired.

Serve warm, if possible. Store in an airtight container at room temperature for up to 1 week.

To reheat cookies, place cookie on microwave-safe plate and microwave on high for 5 seconds, or until cookie is slightly warm.