Zucchini and Ham Casserole | Blue Flame Kitchen

Ingredients

• 4 cups diced zucchini
• 4 tsp canola oil, divided
• 1 small onion, diced
• 1 can sliced mushrooms, drained
• 2 cups diced ham
• 2 tbsp salted butter
• 3 tbsp all-purpose flour
• 1 3/4 cups milk (2%)
• 1 tsp dry mustard
• 1/2 tsp thyme, crumbled
• Freshly ground pepper
• 3/4 cup shredded Swiss cheese, divided
• 1/3 cup fine dry bread crumbs
• 2 tbsp melted salted butter