– 3 Tbsp butter (≈ 42 g)

– 3 Tbsp all-purpose flour (≈ 24 g)

– 2 cups chicken stock (≈ 475 ml)

– ½ tsp ground cumin

– 1 cup plain Greek yogurt or sour cream (≈ 240 g)

– 8 medium tortillas (flour or corn)

– 3 × 6‑oz cans lump crab meat, drained (≈ 510 g total)

– 1 × 15‑oz can Great Northern beans, rinsed and drained (≈ 425 g)

– 3 cups shredded Pepper Jack cheese (≈ 340 g)

– 2 medium avocados, peeled, pitted and diced (≈ 300 g)

– ½ cup chopped fresh cilantro leaves (≈ 15 g)

– ¼ cup crumbled queso fresco or cotija cheese (optional, ≈ 30 g)