Heat the oven to 400°F and line a large sheet pan with foil. Place the pan in the oven on the middle rack while the oven preheats.
To blanch the green beans, fill a large saucepan with 3 quarts of water and 1 tsp kosher salt. Bring the water to a rolling boil. While the water boils, prepare a medium bowl with ice water and set the bowl on the counter near the saucepan. Place the green beans in the salted water and cook 1½ minutes. Immediately, use a slotted spoon to transfer the beans to the ice water and leave them submerged for 5 minutes. Drain the beans, and pour them onto a paper towel-lined platter. Use paper towels or a clean dishcloth to gently dry the beans.
1 lb. fresh green beans, 2 tsp kosher salt
In a large bowl, mix green beans, olive oil, 1 tsp salt, and black pepper.
2 tbsp good olive oil, ¼ tsp ground black pepper
Remove the heated pan from the oven and turn the beans out onto the hot pan. Cook for 5 minutes.
While the beans cook, melt the butter in the microwave and add the garlic; mix well.
2 tbsp unsalted butter, 1 garlic clove
In a medium bowl, toss together the breadcrumbs, garlic butter, cheddar, jalapeno and Parmesan cheeses.
⅓ cup panko bread crumbs, ½ cup cheddar cheese, ½ cup jalapeno pepper cheese, ¼ cup Parmesan cheese
Remove the sheet pan from the oven and sprinkle the breadcrumb/cheese mixture over the beans.
Turn the oven to broil and place the pan back on the middle rack. Broil the beans until the cheese is melted and begins to brown and gets crispy. Watch closely – breadcrumbs and cheese can burn easily.
Remove the pan from the oven and transfer the beans to a serving dish. Serve immediately and enjoy.