Before starting, preheat the oven to 425˚F.Remove 2 tbsp (4 tbsp) butter from the fridge and set aside to come up to room temperature.Wash and dry all produce. Quarter potatoes. Cut any larger potatoes into 1-inch pieces.Add potatoes and 1 tbsp (2 tbsp) oil to a parchment-lined baking sheet. Season with BBQ Seasoning, salt and pepper, then toss to coat. Roast in the middle of the oven, flipping halfway through, until tender and golden-brown, 22-25 min.

Meanwhile, arrange bacon strips in a single layer on another parchment-lined baking sheet. Roast bacon in the top of the oven, flipping halfway through, until golden-brown and cooked through, 12-14 min.\*\*Using tongs, transfer bacon to a paper towel-lined plate. Carefully transfer bacon fat to a small heat-proof bowl. Reserve.

Meanwhile, add Dijon, whole grain mustard, mayo and honey to another small bowl. Season with salt and pepper, then stir to combine.Core, then cut apple into 1/4-inch slices.

When bacon is done, heat a large non-stick pan over medium-high heat.When the pan is hot, add 1/2 tbsp (1 tbsp) reserved bacon fat, then apples. Sprinkle 1 tsp (2 tsp) sugar over apples. Cook, gently stirring occasionally, until apples are lightly caramelized, 2-3 min.Remove the pan from heat.

Meanwhile, halve buns.Arrange buns on an unlined baking sheet, cut-side up. Spread 2 tbsp (4 tbsp) softened butter on cut sides.Sprinkle cheese over top buns. Toast in the top of the oven until cheese is melted and bottom buns are golden, 4-5 min. (TIP: Keep your eye on buns so they don't burn!)

Thinly slice chicken.Spread some honey-mustard mayo on bottom buns, then stack with chicken, bacon, apples and spinach. Close with top buns. Halve melts, if desired.Divide melts and roasted potatoes between plates. Serve remaining honey-mustard mayo alongside for dipping.