Corn Potage (Japanese Corn Soup) with Homemade Croutons

Name: Corn Potage (Japanese Corn Soup) with Homemade Croutons
Prep time: 5 min
Cook time: 25 min
Total time: 30 min
Cuisine: Japanese
Ingredients: 150 g baguette (cubed); 1 tbsp olive oil; 1 tsp dry mixed herbs; 1/8 tsp salt; 1 tbsp unsalted butter (melted); 2 ears of corn (see note for using canned/frozen); 2 tbsp unsalted butter; 100 g yellow onion (thinly sliced); 300 ml whole milk; 4 pinches salt; 4 pinches white pepper; heavy cream (optional)