Step 1

Finely chop 1 small yellow onion and peel and mince 4 garlic cloves. Pick the fronds from the 1 small bunch fresh dill and coarsely chop until you have 2 tablespoons. Cut 8 ounces cream cheese into 8 pieces. Pat 4 boneless, skinless chicken breasts dry with paper towels. Season all over with 1 teaspoon of the kosher salt and 1/2 teaspoon of the black pepper.

Step 2

Heat 2 tablespoons olive oil in a large skillet over medium-high heat until shimmering. Add the chicken and cook, flipping halfway through, until golden on both sides, about 10 minutes total. Transfer the chicken to a plate (it will not be cooked through).

Step 3

Add the remaining 2 tablespoons olive oil to the pan and heat until shimmering. Add the onion and cook, stirring occasionally, until tender, about 2 minutes. Add the garlic, and cook, stirring, until fragrant and golden-brown, about 1 minute more. Pour in 1/2 cup dry white wine and simmer, scraping up any browned bits from the bottom of the pan, until almost evaporated, about 1 minute.

Step 4

Pour in 1 1/2 cups low-sodium chicken broth. Add the cream cheese, 2 teaspoons Dijon mustard, the remaining 1/2 teaspoon kosher salt, and remaining 1/4 teaspoon black pepper. Bring to a simmer, whisking frequently, until the cream cheese is melted and combined. Taste and season with more kosher salt and black pepper as needed.

Step 5

Return the chicken and any accumulated juices to the pan. Bring back to a simmer. Cover and reduce the heat to medium. Simmer until the chicken is cooked through, 3 to 5 minutes more. Remove from the heat and sprinkle with the dill and 1/4 teaspoon red pepper flakes.