Fill a medium pot with water and 2 teaspoons of salt. Bring to a boil over high heat.
Peel the 2 medium Russet potatoes & 2 medium Yukon Gold potatoes and chop into 4 pieces each. Carefully lower potatoes into the boiling water. Boil for 15-20 minutes or until fork tender.
Turn off the heat. Strain the water from the potatoes and place the potatoes back into the empty pot.
To the pot, add the 2 tbsp unsalted butter , 1 tsp kosher salt, 0.5 tsp garlic powder, 0.5 teaspoon onion powder, ¼ tsp ground black pepper and ½ cup vegetable broth. Use a potato masher to mash everything together until mostly smooth.
In a medium fry pan, add 1 teaspoons extra virgin olive oil, sliced 1 red bell pepper and 0.5 tsp kosher salt. Saute on medium-high heat for 6-8 minutes until lightly charred. Scoop veggies out of the pan and transfer to a bowl or plate.
Add remaining 1 teaspoons extra virgin olive oil to the pan, and add the drained/rinsed 1 15-ounce can black beans, 0.5 tsp kosher salt, 0.5 tsp garlic powder, 0.5 teaspoon onion powder, and ½ tsp chili powder. Cook for 3-5 minutes, on medium-low heat, stirring occasionally until warmed through.
Optional: Reheat the mashed potatoes if they are no longer warm over medium heat, and add 1-2 tablespoons more broth if needed to thin out the mixture. Mix all together.
Transfer the warm potato mixture to a large serving bowl or two individual bowls.
Top with a layer of sour cream, sauteed peppers, cooked black beans, scallions, and parsley or cilantro. Add radish as garnish if you desire too. Enjoy right away!