Place the chicken tenders in a bowl with the buttermilk and let them sit for at least 30 minutes. This step softens the meat and adds a subtle tang to every bite. I usually marinate mine while I prep the potatoes so the timing lines up perfectly.
In a shallow dish, whisk together the flour, cornstarch, garlic powder, paprika, baking powder, salt, and pepper. This dry mix is what gives the tenders their signature crunch. Make sure it's evenly combined so every piece of chicken gets the same flavor.
Lift each piece of chicken from the buttermilk, letting the excess drip off before pressing it into the flour mixture. Press firmly so the coating clings to every surface. I like to double-dip a few pieces back into the buttermilk and flour again for extra-thick crust.
Heat oil in a deep skillet to around 175°C and fry the tenders in small batches. Cook for about 4 to 5 minutes per side until deep golden brown and cooked through. Avoid crowding the pan, or the oil temperature drops and the coating turns soggy.
While the chicken fries, slice the potatoes into even sticks and toss them with olive oil, paprika, garlic powder, onion powder, and salt. Even cuts matter here since uneven fries cook unevenly. Fry or bake them until golden and crisp on the outside.
In a small bowl, stir together the sour cream, mayonnaise, parsley, chives, garlic, lemon juice, salt, and pepper. Mix until smooth and taste as you go to balance the tang and saltiness. Chill it briefly before serving so the flavors settle.
Plate the chicken tenders and fries together while they're still warm and crisp. Set the herb dip in a small bowl right beside them for easy dunking. This is the moment everyone at my table starts reaching in before I even sit down.