Gather all ingredients to streamline the process.
Cut chicken breasts into 1-inch strips, approximately 3 to 4 inches long.
In a bowl, whisk together buttermilk, Buffalo wing sauce, and garlic powder to make the marinade.
Place chicken strips in the marinade, ensuring they are fully submerged. Cover and refrigerate for 2 hours (or overnight for deeper flavor).
In a large shallow bowl or pie plate, combine flour, oregano, garlic powder, paprika, cayenne pepper, kosher salt, and black pepper.
Remove chicken from marinade, shaking off excess. Dredge each strip in the flour mixture, coating evenly, and place on a baking sheet in a single layer.
Dip each coated strip back into the marinade, then dredge again in the flour mixture for extra crispiness. Discard remaining marinade.
In a deep fryer or large saucepan, heat vegetable oil to 365°F (use a thermometer for accuracy).
Fry chicken strips in small batches for 3 to 4 minutes, until golden brown and cooked through (internal temperature of 165°F).
Remove strips with tongs and place on paper towels to drain excess oil.
Repeat frying for remaining strips, maintaining oil temperature at 365°F.
Serve hot with chipotle mayonnaise, Buffalo aioli, blue cheese, or ranch dressing.