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heat oven to 425 degrees.
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in a small bowl, combine whole-grain mustard, thyme leaves, garlic cloves, butter and dijon mustard.
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season chicken with salt and pepper.
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rub mustard butter mixture all over chicken (some might fall off but that’s o.k.).
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place breadcrumbs in a wide, shallow bowl, then coat the chicken evenly with bread crumbs.
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transfer chicken to a baking sheet and drizzle with olive oil.
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bake until chicken is golden and no longer pink, 35 to 40 minutes.