In a large pan heat olive oil over medium heat. Add diced potatoes, garlic powder, cayenne and cumin. Stir to combine and cover. Cook, stirring frequently until potatoes are crispy and cooked through (approx. 20 minutes). Remove from heat and add salt.
While potatoes are cooking, make rice and heat beans over low heat.
TO ASSEMBLE: add 1/2 cup rice, 1/4 cup beans, 1/2 cup potatoes, 1 cup of spinach and salsa (to taste) to a bowl.
Add optional toppings, serve and enjoy!