SUNDAY BRUNCH: Grown-up Pigs in Blanket

Ingredients

• 1 tbsp. oil + 3 tbsp. butter
• 4 bratwurst
• 1 large onion, sliced
• 1 tsp. dried thyme
• 4 tbsp. Dijon mustard
• 2 puff pastry sheets, thawed and cut in half
• 1 cup shredded cheddar cheese
• 1 large egg + 1 tsp. water, beaten together
• ¼ cup butter, melted
• ¼ tsp. garlic powder
• ¼ tsp. kosher salt
• 1 tbsp. chopped parsley