In a mixing bowl, combine peas, carrots, and shredded cheddar cheese.
In a saucepan, melt the butter over medium heat. Stir in the flour and cook for 1-2 minutes. Gradually add the milk, stirring constantly until the mixture thickens.
Pour the sauce over the peas and carrots mixture. Stir to combine. Season with salt and pepper to taste.
Transfer the mixture to a casserole dish. Bake in the preheated oven for 30 minutes, or until the top is golden and bubbly.
Let it cool for a few minutes before serving. Enjoy!
Notes:
This casserole is a great side dish or even a main course. Feel free to add other vegetables or proteins to make it your own.