Preheat your oven to 400°F and line a baking sheet with parchment paper.
Chop the red bell pepper and slice the zucchini into half-moons, then toss them on the baking sheet with the sea salt, black pepper, and half of the garlic powder.
Roast the vegetables for 15-20 minutes until they are tender and slightly caramelized around the edges.
While the vegetables roast, drain the extra firm tofu and press it firmly between paper towels to remove as much moisture as possible, then cut into 1-inch cubes.
In a medium bowl, whisk together the tamari, nutritional yeast, smoked paprika, and the remaining garlic powder, then gently toss the tofu cubes in the mixture until coated.
Heat the olive oil in a large non-stick skillet over medium-high heat and sear the tofu for 3-4 minutes per side until a golden, crispy crust forms.
In a small jar or bowl, whisk the lemon juice and Dijon mustard together to create a light dressing.
In a large serving bowl, combine the fresh baby spinach, cooked lentils, and roasted vegetables.
Top the salad with the warm seared tofu and drizzle the lemon-dijon dressing over the top before tossing gently to serve.