Heat oven to 425ºF
Make the dip:In a small bowl, add lemon juice and garlic. Let sit for 5 minutes (this mellows the raw garlic flavor). Mix in yogurt and herbs; season with salt and pepper, to taste. Set aside.
Prepare the chicken: On medium-high heat, melt 2 tablespoons butter in an 8-inch skillet. When butter stops foaming, add panko bread crumbs and season with a good pinch salt and pepper. Cook, stirring often until crumbs are deep golden brown, 3 to 4 minutes. Add crumbs to a shallow baking dish and set aside.
Dry the chicken well and season with salt and pepper. In a large bowl, mix together garlic, lemon zest, mayonnaise and mustard. Add chicken and mix well to coat each piece.
Lightly spray an oven-safe wire rack with oil spray and place it over a rimmed baking sheet. Dip chicken pieces into bread crumb mixture, pressing to adhere as many bread crumbs as possible. Shake off any excess and place breaded chicken on the wire rack. Bake until cooked through and golden brown, 12-15 minutes. Serve with herb yogurt dip.