spinach, mushroom and feta bread pudding

Ingredients For spinach, mushroom and feta bread pudding

• 2 c

  whole milk
• 5 lg

  eggs
• 1 tsp

  salt
• freshly ground black pepper to taste
• 8 c

  day-old french or italian bread, roughly torn into 1 1/2 inch cubes
• 3 Tbsp

  olive oil
• 1 lg

  onion, diced
• 10 oz

  mushrooms, sliced
• 2 lg

  cloves garlic, minced
• 1 pkg

  10-oz pkg. frozen leaf spinach, thawed and squeezed very dry
• 6 oz

  feta cheese, crumbled
• 1 Tbsp

  fresh thyme leaves, finely chopped
• nonstick vegetable spray
• 1/4 c

  asiago cheese, grated