Oh wow...the chorizo sausage really adds great flavor to these easy-to-make tostadas. Give them a try...your family will love them!
Cook the sausage in a 12-inch skillet over medium-high heat until well browned, stirring often to separate meat. Remove the sausage from the skillet. Pour off any fat.
Add the oil to the skillet and heat over medium-high heat. Add the potatoes and cook until browned, stirring occasionally. Stir in 1/2 cup picante sauce and the beans. Return the sausage to the skillet and heat to a boil. Reduce the heat to low. Cook for 5 minutes, stirring occasionally.
Heat the butter in a 10-inch skillet. Add the eggs and cook and stir until scrambled and cooked through. Season to taste.
Divide the sausage mixture among the tostadas. Top with the eggs and cheese. Serve with the remaining picante sauce, spooned on top and/or on the side.