Boil the Potatoes: Fill a large pot with water, add salt, and bring to a boil. Add diced potatoes and cook for 10-12 minutes until fork-tender. Drain and set aside.

Prepare the Broccoli: In the same pot, add water and bring to a simmer. Add broccoli florets, steaming for 3-4 minutes until bright green and tender-crisp. Drain and set aside.

Sauté the Garlic: Heat a large skillet over medium heat, add olive oil, and sauté minced garlic for about 30 seconds until fragrant and lightly golden.

Combine Ingredients: Add cooked potatoes and steamed broccoli to the skillet, season with salt and black pepper, and drizzle lemon juice. Gently toss and heat through for 3-4 minutes.

Serve and Garnish: Transfer to a serving dish, sprinkle with grated Parmesan (if using), and garnish with fresh parsley. Serve warm.