Preheat your oven to 400°F (200°C).
Slice the zucchini and red bell pepper into bite-sized pieces and toss with dried oregano and a pinch of salt.
Spread the vegetables on a parchment-lined baking sheet and roast for 15-20 minutes until tender and slightly browned.
While vegetables roast, steam the tempeh for 10 minutes to soften its texture, then slice into triangles.
Heat a grill pan over medium-high heat and lightly coat with non-stick spray; grill the tempeh for 3-4 minutes per side until distinct grill marks appear.
In a small saucepan, combine the cannellini beans, minced garlic, and nutritional yeast over medium heat until warmed through.
Mash the bean mixture with a fork until creamy, adding a tablespoon of water if needed to reach your desired consistency.
Plate the white bean mash, top with the roasted vegetables and grilled tempeh, and finish with a fresh squeeze of lemon juice.