Step 1

Heat a dutch oven over medium heat with 1" of oil (or enough to cover the onion rings). You can use a deep fryer if you have one.

Step 2

In a medium bowl, whisk together 1 cup milk with 1 Tbsp vinegar and let sit 5 minutes. Whisk in 1/2 cup sour cream.

Step 3

In a separate bowl, whisk together: 1 cup flour, 1/2 Tbsp salt, 1/4 tsp black pepper, and 1 tsp garlic powder.

Step 4

Separate the onion rings and dip each ring in the milk mixture, then dredge with flour. (I used a fork to transfer from the wet bowl to the dry bowl so my hands didn't get as gunky). Repeat by dipping in milk mixture a second time and dredging again in flour. Place the finished onion rings on a plate until ready to fry.

Step 5

Once the oil is at 375˚F on a thermometer, or hot enough for the onion rings to sizzle, place 3-4 double battered onion rings in a single layer in the hot oil and cook for about 3 minutes, flipping halfway and fry until exterior is crisp and light golden brown. Let onion rings cool on paper towels so soak up any excess oil.