In a large skillet, melt the butter over medium heat. Once it's foamy, add the onion and bell pepper, sautéing for about 5 minutes until soft and translucent.

Sprinkle in the flour and Cajun seasoning, stirring constantly for 1-2 minutes until the mixture turns light golden brown.

Gradually pour in the chicken broth while continuously whisking to prevent lumps. Increase heat to medium-high and bring to a simmer for about 5 minutes.

Reduce the heat to low and stir in the heavy cream, mixing until creamy and well combined. Cook for another 2-3 minutes.

Taste and adjust seasoning, adding more Cajun seasoning or a pinch of cayenne if desired. Whisk in more broth or water if too thick.

Remove from heat and drizzle over your favorite dishes like pasta, seafood, or grilled meats.