Preheat the oven to 375°F. Season both sides of the chicken thighs generously with salt and pepper.
In a small bowl, whisk the chicken broth, lemon juice, garlic, and red pepper flakes (adjust the amount for your desired level of spice).
In a large oven-safe skillet, warm the olive oil on medium-high heat. Add the chicken and allow it to brown and sear nicely on both sides, 3 minutes per side, cooking in batches if necessary. Transfer the chicken to a plate— it will finish cooking inside the oven.
Reduce the heat to medium and add the shallots to the skillet along with the chicken broth mixture. Using a whisk, scrape the bottom of the pan so all the brown bits are loosened and the pan is deglazed. Bring the heat back to medium-high and let the sauce come to a full simmer. Allow the sauce to simmer for 10 minutes, until thickened and reduced to about ⅓ cup.
Remove the sauce from the heat, add the butter, and whisk until it melts completely. Add the cream and whisk until smooth. Place the skillet back on the heat for just under 30 seconds (do not allow the sauce to boil or burn). Remove from the heat, add the chicken back to the pan and baste the sauce over the chicken.
Cook the chicken in the oven for 6 to 8 minutes, until the chicken is completely cooked through; you can slice into a piece right down the center to check that it’s fully cooked.
Garnish with thyme, pine nuts, and lemon slices.