Begin by heating the cooking oil in a large skillet over medium-high heat. Ensure the oil is hot before adding the curry paste.
Add the red curry paste to the skillet. Sauté for about 30 seconds, stirring constantly, until the paste becomes fragrant.
Pour in the coconut milk, stirring to combine it with the curry paste. Let it simmer for a minute to create a luscious sauce.
Add the red bell pepper and fresh mushrooms to the skillet. Stir them in, allowing them to cook for about 2-3 minutes, until they are slightly tender.
Next, add the shrimp to the skillet, stirring them into the sauce. Cook for another 3-4 minutes, or until the shrimp are pink and cooked through.
If desired, toss in the basil leaves just before serving for an aromatic touch. Serve your curry over a bed of cooked rice and enjoy!