PREHEAT oven to 400 degrees.
LINE a baking sheet with parchment paper or foil. If using foil, spray foil evenly with nonstick cooking spray.
In a small bowl, WHISK 2 Tablespoons olive oil, melted butter, lemon juice, honey, brown sugar, mustard, garlic, Italian seasoning, and 1 teaspoon seasoning salt. Set aside.
RESERVE 1/4 cup of the honey-garlic sauce for later use.
PLACE the diced potatoes onto the baking sheet and DRIZZLE potatoes with 1 Tablespoon of olive oil. SPRINKLE potatoes with remaining 1/2 teaspoon seasoning salt.
STIR gently to evenly coat. ARRANGE potatoes in a single layer on one side of the baking sheet.
PLACE chicken on the other side of the baking sheet. BRUSH remaining honey-garlic sauce over the chicken pieces.
BAKE in the oven for 30 minutes.
While the potatoes and chicken are baking, In a medium bowl, COMBINE 1 Tablespoon of olive oil with the reserved honey garlic sauce and broccoli, stirring to COAT evenly.
After chicken has cooked for 30 minutes, REMOVE from oven and carefully STIR broccoli in with the potatoes.
RETURN to the oven, BAKE an additional 10-15 minutes or until the chicken is no longer pink and the potatoes are tender. If potatoes are not tender, REMOVE chicken to a plate, and continue to BAKE potatoes until done.