Heat a gas grill to medium-high (or preheat a grill pan over medium-high heat).
Coat both sides of the steaks with Stubb's Beef Spice Rub and drizzle with olive oil to lightly coat.
Remove husks and silks from the corn, then season the ears with spice rub and a drizzle of olive oil.
Place the steaks and corn on the grill. Grill steaks about 4–5 minutes per side for medium-rare, or until desired doneness. Grill corn, turning frequently, until lightly charred, about 10 minutes total.
Transfer the steaks to a cutting board and let rest for 10 minutes, then cut into bite-sized pieces and toss with about 2 tablespoons Stubb's BBQ Sauce.
Cut the kernels from the grilled corn cobs and set aside.
Preheat the oven to 375°F (190°C).
Arrange a layer of tortilla chips on an oven-safe pan or cast-iron skillet.
Pile the BBQ-tossed steak over the chips, then scatter the pinto beans, grilled corn kernels, and shredded Mexican blend cheese evenly over the top.
Bake in the preheated oven until the cheese is melted, about 5–10 minutes.
Remove from the oven and top with salsa, sliced avocado, jalapeño, chopped cilantro, chopped red onion, sour cream, and additional BBQ sauce as desired, then serve immediately.