Step 1
Preheat oven to 350 F
Step 2
Melt 1 stick butter in a Dutch oven over medium heat
Step 3
Add onion and sauté until translucent
Step 4
Remove from heat
Step 5
Add soup, sour cream, cheddar cheese, Monterey Jack cheese, salt and pepper
Step 6
Stir until blended well
Step 7
Add hash browns and mix again
Step 8
In a separate small bowl, melt 1 stick of butter using a microwave, then add panko and mix
Step 9
Spread panko topping evenly over the top of the casserole, cover with lid and bake 40 min
Step 10
Remove lid and bake an additional 5-10 min, or until the topping is golden brown
Step 11
Rest at room temperature 10 minutes before serving