Preheat the oven to 425°F for the broccoli and prepare a small pot for the mashed potatoes.
Season the chicken breast with salt, pepper, and half of the chopped herbs. Squeeze the juice from half a lemon over the chicken.
Heat a skillet over medium-high heat and lightly add a small splash of olive oil. Sear the chicken for about 4-5 minutes on each side until golden and cooked through.
Meanwhile, peel and dice the russet potato. Boil in salted water until tender, about 15 minutes.
In a small saucepan, melt the butter and add the minced garlic, cooking until fragrant. Drain the potatoes and mash them with the garlic butter mixture. Season with salt, pepper, and the remaining fresh herbs.
Toss the broccoli with a drizzle of olive oil, salt, and pepper, then roast in the preheated oven for about 12-15 minutes until the edges are crispy.
Plate the chicken alongside a generous serving of creamy garlic mashed potatoes and crispy roasted broccoli. Enjoy your balanced and flavorful meal.