Comforting Brisket Pot Pie with Cheddar and Golden Crust

Ingredients

• 2 cups shredded cooked brisket
• 1 cup diced red bell peppers
• 1 cup diced yellow or white onion
• 2 garlic cloves, minced
• 3/4 cup grated cheddar cheese
• 3/4 cup grated Monterey Jack cheese
• 3 tablespoons all-purpose flour
• 1 cup beef broth
• 1/2 cup heavy cream
• 1/2 teaspoon dried thyme
• 1/2 teaspoon kosher salt
• 1/4 teaspoon ground black pepper
• 2 9-inch pie crusts, butter-based recommended
• 1 egg, beaten with 1 tablespoon water for egg wash