Sweet Corn and Potato Gratin | Reader's Digest Canada

Ingredients

• 1 medium onion (thinly sliced)
• 2 tbsp butter
• 2 tbsp all-purpose flour
• 2 garlic cloves (minced)
• 1 tsp salt
• 1/2 tsp pepper
• 1 cup whole milk
• 2 lb medium Yukon Gold potatoes (peeled and cut into 1/8-inch slices)
• 2 cups fresh or frozen corn
• 1 can cream-style corn (8-1/4 ounces)
• 3/4 cup panko bread crumbs
• 1 tbsp butter (melted)