Prep the Pan: Preheat oven to 350°F. Grease a 9-inch heart-shaped pan.

Make the Dough: Cream butter and sugars until smooth. Add egg and vanilla. In a separate bowl, whisk dry ingredients and add to wet mixture. Fold in chips, chunks, and M&Ms.

Bake: Press dough into the pan evenly. Top with sprinkles. Bake for 20–22 minutes until edges are lightly golden. Let cool in pan, then transfer to wire rack.

Make Frosting: Beat butter, powdered sugar, cream, and vanilla until smooth. Add pink coloring and mix.

Decorate: Pipe frosting around the edges and add extra sprinkles. Optional: write a message in the center using a fine tip.