Reduce heat to medium and toss in spinach. Saute until wilted, about 1-2 minutes.
Add beans, paprika, cumin, cayenne, cilantro and salt and pepper and toss. Remove from heat.
Add in rice and toss.
Heat a large skillet over high heat and add oil, red pepper flakes and garlic. When garlic begins to brown and oil is sizzling, add steak. Saute for a minute or less on each side.
Serve rice with a few dashes of hot sauce and top with steak.
Recipe by Weekend Table at https://weekendtable.com/2012/10/14/spicy-beans-and-rice-with-zucchini-baby-spinach-and-flank-steak/