Preheat oven to 450°F.
Place green beans and shallots in a bowl. Drizzle with olive oil, and sprinkle with salt and pepper. Toss with your hands until everything is evenly coated. Add pancetta and toss again. Spread the mixture in an even layer on a sheet pan. Roast for 20-25 minutes, or until tender, tossing occasionally.
While the green beans are roasting, toast the nuts in a saute pan over medium heat for 3-5 minutes, or until golden.
Divide the green beans evenly among 6 plates. Top evenly with blue cheese and toasted nuts.