Preheat oven to 400 degrees.
Clean lemons and potatoes in cool water, and a splash of vinegar. (The vinegar helps clean fruits and veggies, and leaves no after-taste).
Cut each lemon lengthwise into 8 pieces. Cut potatoes in half. Place on the large sheet pan.
Next, slice the baguette bread loaf into 1" pieces and place those onto the sheet pan. Drizzle the oil, salt, and pepper and toss well to combine on the pan. (You can also do this in a very large bowl, but that is one more dish to clean!)
In a small bowl, mix smoked paprika (not hot paprika) and lemon pepper. Next, cut the chicken into 1” cubes, and toss the chicken cubes in the paprika and lemon pepper mix.
Place chicken pieces on top of lemons, bread, and potatoes. (note: if you leave the chicken breasts whole, I found it is much harder to get everything to brown nicely and to cook evenly.)
Bake at 400 degrees 25 minutes, then drizzle a little more olive oil and toss again using tongs.
Finish baking at 400 for 25 more minutes until the bread is toasted, and the chicken is lightly browned and baked.