Step 1

In bowl, combine butter, garlic, lemon zest, Dijon mustard, and 1/4 teaspoon each kosher salt and pepper. Fold in parsley and Parmesan.

Step 2

Heat large cast-iron or nonstick skillet on medium-low. Spread butter on cut sides of focaccia and cook 2 pieces at a time, butter side down, until golden brown and crisp, 5 to 7 minutes. Flip and cook on other side 1 minute. Wipe out pan and repeat with remaining focaccia. Cut into sticks.