In a small bowl, mix together the flour, baking soda, baking powder, and salt. Set aside.

In a large mixing bowl, cream together the softened butter, granulated sugar, and light brown sugar until smooth and fluffy.

Add the egg and vanilla extract to the butter-sugar mixture. Beat until fully combined.

Gradually add the dry ingredient mixture to the wet ingredients, beating until fully incorporated.

Fold in the chocolate chips, ensuring they are evenly distributed throughout the dough.

Press about half of the dough into the prepared baking pan, leaving a slight gap from the edges of the pan.

Place the miniature Reese's cups (or your candy of choice) evenly spaced on top of the dough.

Spread the remaining dough over the candy, covering it completely on all sides.

Bake for 25-30 minutes, or until the top is golden brown and a toothpick inserted comes out clean.

Allow the bars to cool in the pan for at least 30 minutes before lifting them out using the parchment paper. Cut into squares and serve.