Preheat oven to 425 degrees. Line two large baking sheets with parchment paper.
In a large bowl, fold together the black beans, smoked paprika, chipotle chili powder, cumin, oregano, garlic powder, jalapeños, green onions, cilantro, cream cheese, cheddar cheese, and a pinch of salt and pepper. Combine until evenly distributed.
Microwave the tortillas under a damp paper towel for 20-30 seconds until pliable. Lay a tortilla on a flat surface and rub both sides with a bit of olive oil. Spoon 2 tablespoons of filling into the center. Roll the tortilla and place seam side down on the baking sheet. Repeat with the remaining tortillas and filling. If any of the filling pops out, stuff it back in. Show it who's boss.
Bake for 8-10 minutes on one side. Flip the tortillas and rotate the pans, then bake an additional 8-10 minutes until golden and crispy all over.
To make the ranch, combine all ingredients in a food processor and whip until smooth and creamy. If the dressing is too thick, add milk 1 tablespoon at a time until desired consistency is reached.
Serve taquitos immediately with ranch, limes, extra cilantro, and sliced avocado, as desired.