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