Heat a pan. Add butter. Once butter starts to melt add flour. Stir using a spatula for a minute on low-medium heat. (Avoid burning).
Once the raw flavor of the flour is gone, slowly add warm milk. Whisk carefully to make a smooth mixture and avoid any lump.
Add Corn Kernels and boiled Spinach . Mix well.
Add salt and pepper to taste. Take the pan off the heat.
Add grated cheese. Mix using a spatula till cheese well incorporated.
Take a bread slice and spoon the Spinach Corn mixture. Top with another bread. Spread butter. Grill on a griddle pan or hot tawa till crispy from both sides.
Notes :
Sometime I add Italian seasoning to the mixture for a variation.
For spicier version you can also sprinkle some chili flakes after you spoon the filling.
Add any cooked vegetable of your choice.
You can also add cooked pasta to spinach corn filling.