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, to taste, 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!)

Spread some honey-mustard mayo on bottom buns, then stack with 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.