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 and pepper
• – 4 to 6 slices crusty French bread, diced large