Preheat oven to 475°; add half the potatoes to a large pot, add water to cover 2 inches + 2 tsp salt; bring to a boil & cook 10-12 min til tender; drain, add on a pan to cool slightly; using the bottom of a glass, smash, drizzle with 2-3 tbsp oil, salt/pep; roast 10 min, flip + roast 10-15 min til golden

Wipe mushrooms + slice; heat 1 tbsp oil in skillet over high, cook 3 min; sauté 3-4 min, add salt/pep

Heat 1 tbsp oil in large skillet over med-high + sauté half the spinach + salt/pep 1-2 min; add rest of bag, cook 1-2 min, drain + rinse beans

Add all sauce to the pan with beans, heat over med til hot then mix in 2 -4 tbsp mayo for a rosa sauce; divide all to bowls