1. Adjust oven rack 6 inches from broiler element and heat broiler. Line rimmed baking sheet with aluminum foil. Place peppers cut side down on large plate and microwave until just tender, about 8 minutes. Pat dry.
2. Meanwhile, heat oil in 12" skillet over medium high heat until shimmering. Add beef, sausage, and giardiniera and cook, breaking up meat with wooden spoon, until meat is no longer pink, about 5 minutes. Stir in rice, 1 cup Monterey jack, and scallions and season with salt and pepper to taste.
3. Place peppers, cut side up, on prepared baking sheet and fill with beef mixture. Sprinkle with remaining 1 cup monterey jack. Broil until cheese is melted and spotty brown, about 3 minutes. Serve.
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