Step 1

Heat olive oil in a 10-inch cast iron skillet over medium heat. Add onion and cook, stirring frequently, until translucent, about 2-3 minutes.

Step 2

Stir in garlic until fragrant, about 1 minute.

Step 3

Stir in wine, scraping any browned bits from the bottom of the skillet.

Step 4

Str in spinach, artichokes and red pepper flakes until warm and excess liquid has reduced, about 4 minutes.

Step 5

Stir in cream cheese and sour cream until melted and heated through, about 5 minutes. Remove from heat.

Step 6

Stir in Parmesan; season with salt and pepper, to taste. Sprinkle with mozzarella.

Step 7

Preheat oven to broil on high. Arrange an oven rack 6-inches from the broiler.

Step 8

Place skillet into oven and broil until golden brown and bubbly, about 3-5 minutes.

Step 9

Serve immediately.