Cheesy Garlic Butter Hasselback Potatoes

1 1/2 lbs new or small potatoes
1/4 cup butter, melted
1/4 cup olive oil
3 cloves garlic, minced
Kosher salt
Freshly ground black pepper
1 cup shredded mozzarella
1/2 cup freshly grated Parmesan
1/4 cup finely chopped parsley

Preheat your oven to 375 degrees.  Line a large baking sheet with foil.

Slice each potato like an accordion, making sure not to cut all the way through.  Place potatoes on the sheet pan.

In a small bowl, whisk together melted butter, olive oil and garlic.  Brush mixture over potatoes then season with salt and pepper.  Bake for 20 minutes, until the slits are starting to separate, and the potatoes are beginning to turn golden.  

Brush the potatoes with more of the melted butter mixture then sprinkle mozzarella and Parmesan on top.  Bake for another 23 - 25 minutes, or until the potatoes are crispy on the outside and tender on the inside.

Garnish with parsley and serve warm.