In a large bowl, mix ground beef, green onions, cilantro, cheddar, cumin, chili powder, salt, and pepper until well combined.
Cut flour tortillas into even strips about 2 inches wide.
Spread a thin layer of the meat mixture evenly over the tortilla strips.
Stack the filled strips into a multi-layer slab and press gently to bind.
Slice the slab into long strips and insert wooden skewers lengthwise through each.
Grill over medium-high heat, turning occasionally, until meat is cooked and edges are crispy.
Blend sour cream, jalapeños, cilantro, garlic, lime juice, and salt until smooth.
Drizzle the green sauce over the hot kebabs and serve immediately.
Tip: Soak skewers in water for 20 minutes before using to prevent burning on the gri