Squash and Asparagus Casserole

Ingredients

• 1 tbsp. cooking oil
• 4 tbsp. Real California butter, divided, plus more for the baking dish
• 12 asparagus spears, cut in thirds
• 6 yellow squash, sliced
• 5 large shallots, diced
• 2 large garlic cloves, minced
• Pinch ground cayenne, or more to taste
• 2 tbsp. dried thyme leaves, divided
• 1 cup shredded Real California sharp Cheddar cheese, or more to taste
• 1/2 cup grated Real California Asiago cheese, or more to taste
• 1/2 cup Real California sour cream or crème fraîche
• 1/3 cup Real California heavy cream
• Salt
• pepper
• 4 to 6 slices crusty French bread, diced large