In a pot of boiling water, cook green beans until tender, 6-8 minutes.
Meanwhile, in a large skillet, melt butter over medium heat. Add pine nuts; cook and stir until lightly browned, 3-4 minutes. Remove from heat; sprinkle with salt.
Drain beans; return to pot. Place cheese over warm beans to soften; toss to coat. Add red peppers; toss to combine. Sprinkle with pine nuts. Serve immediately.