In a large skillet, cook onions and bell peppers over high heat until browned. Remove from skillet and set aside.
In the same skillet, cook shrimp and sauce, stirring only occasionally until shrimp are opaque (add water if needed). Remove and chop shrimp into 1" pieces.
In a clean skillet, melt butter over medium heat. Place a tortilla inside, and layer cheese, vegetables, and shrimp on top. Top with extra cheese and add second tortilla. Cook on both sides, adding butter as needed.
Remove tortilla and repeat with the rest of tortillas.
To serve, cut tortillas into wedges and garnish with sour cream, cilantro, and lime.