Oyster Gratin with Horseradish and Parmesan - VeryVera

Ingredients

• 4 tbsp. butter
• 1/4 c flour
• 1/2 onion, chopped
• 2 cloves garlic, thinly sliced
• 2 c milk
• 2 heaping tablespoons prepared horseradish
• salt and pepper, to taste
• 18 oysters, shucked, drained and patted dry
• 1/3 c dried breadcrumbs
• 1/3 c grated Parmesan cheese
• 1/3 c olive oil
• Dash to 1 tsp crushed red pepper flakes