Brownie Sandwich Cookies with Salted Caramel Frosting

Preheat oven to 350°F.

For the Cookies:

1. In a microwave-safe bowl, combine the olive oil and chocolate chips. Microwave in 30-second increments, stirring between each, until fully melted and smooth.
2. In a large bowl, whisk together the eggs, sugar, and vanilla extract until the mixture becomes slightly lighter in color.
3. Add the melted chocolate mixture to the egg mixture and whisk until fully incorporated.
4. Add the flour, cocoa powder, espresso powder (if using), baking powder, and salt. Fold together until just combined.
5. Let the dough rest for 15 minutes so the flour can hydrate.
6. Scoop dough onto a prepared baking sheet, spacing cookies apart.
7. Bake for 11 minutes at 350°F.
8. Allow cookies to cool completely before frosting.

For the Salted Caramel Frosting:

1. Add butter to a stand mixer with a whisk attachment and beat on medium speed until smooth.
2. Add powdered sugar and milk, then mix until fluffy.
3. Add the salted caramel sauce and gently mix until combined. Transfer frosting to a piping bag.

Assembly:

1. Pipe frosting onto the bottom of one cookie.
2. Place another cookie on top to form a sandwich. Repeat with remaining cookies.
3. Enjoy!