Pre-heat the oven to 450°F.
Crisp up the bacon in a skillet over medium-high heat; remove to a paper towel-lined plate to drain. Stir the garlic into the drippings; cook for 1 minute, then add the breadcrumbs and combine. Season with onion, coriander, cumin and parsley; mix in the grated cheese.
Season the chicken with salt and pepper on both sides and arrange on a parchment-lined or nonstick baking sheet. Slather the chicken with mustard and pack the breadcrumbs evenly into place.
Arrange the beans and potatoes on a second baking sheet and coat with oil; season with smoked paprika, salt and pepper and roast for 15 minutes. Reduce the heat to 425°F, then add the chicken to the oven and roast for 30 minutes more – the chicken should be cooked through and browned and crispy; the potatoes should be brown and the beans very tender and golden at the edges.
Toss the potatoes and beans with the scallions and serve alongside chicken.