Preheat and prep: Preheat your oven to 220°C (425°F). Line a rimmed baking sheet with foil or parchment for easier cleanup and even roasting. High heat encourages caramelization on the squash, which builds sweet, savory flavor important to balance the tangy crema.

Season and roast the squash: Toss the 480 g cubed acorn squash with 2 tsp (about half) of the olive oil, 1/2 tsp salt and a few grinds of black pepper. Spread in a single layer on the baking sheet—crowding will steam the squash instead of caramelizing it. Roast for 20–25 minutes, tossing once halfway, until the edges are golden and the centers are tender when pierced. Roasting concentrates the squash’s sugars and gives you sweet‑savory bites that stand up to the beans and eggs.

Char the corn: While the squash roasts, heat a heavy skillet (cast‑iron is ideal) over medium‑high heat. Add 1 tsp olive oil and then the 1 cup corn kernels in an even layer. Let them sit untouched for 2–3 minutes to develop a golden char, then stir and let another 1–2 minutes. Charring adds smoky notes that echo the smoked paprika and give texture contrast.

Build the bean mixture: Push the charred corn to one side of the pan (or remove and set aside), add the remaining 1 tsp olive oil, then add the sliced 1/2 medium yellow onion and sauté 3–4 minutes until translucent. Add the 4 minced garlic cloves and the 1 tbsp optional finely chopped green chile (if using) and cook 30 seconds—this step lets the garlic and chile bloom without burning. Stir in the 1 cup rinsed black beans, charred corn, 1 tsp ground cumin and 1/2 tsp smoked paprika. Cook 2–3 minutes until warm and the spices are fragrant; finish with salt to taste. Warming the beans and spices together lets flavors marry and ensures hot, cohesive filling.

Prepare the cilantro‑lime crema: In a small bowl, whisk together 1/2 cup Greek yogurt (or 1/2 cup Mexican crema), 2 tbsp fresh lime juice, 3 tbsp chopped cilantro and a pinch of salt. Taste and adjust: more lime if you want brighter acidity, or a splash of water to loosen if too thick. The crema’s acidity and herbal brightness cut through the richness of eggs and avocado.

Warm the tortillas: Stack the 8 corn tortillas and warm them briefly—either directly over a gas flame for 10–20 seconds per side (toasty edges and slight charring) or in a dry skillet over medium heat 30–45 seconds per side. Warming makes tortillas pliable so they fold around the toppings instead of cracking.

Cook the eggs: You can fry or poach the eggs; for classic huevos rancheros fry them sunny‑side up. Heat a nonstick skillet over medium heat with a thin film of oil or a dab of butter. Crack 2 eggs per person (8 eggs total, but work in batches if your pan is small). Cook until whites are set but yolks remain runny, 2–3 minutes; cover the pan for the last 20–30 seconds if the whites are still glossy at the edges. A runny yolk creates the sauce that melds the components on the tortilla.

Assemble the plates: For each serving, place two warmed tortillas on a plate. Spoon a generous portion of the black‑bean and charred‑corn mixture across the tortillas, then scatter 120 g roasted acorn‑squash cubes over the beans. Gently set two fried eggs on top.

Finish with toppings: Arrange sliced avocado (1/4 medium per person), halved cherry tomatoes (4 per person), and a drizzle of the cilantro‑lime crema over the eggs. Sprinkle remaining chopped cilantro, a pinch of smoked paprika if you like, and a squeeze of fresh lime. The assembly layers texture—creamy avocado, juicy tomatoes, crisp tortillas and silky yolk—so each bite is balanced.

Serve immediately: Huevos are best enjoyed hot so the yolks are runny and the tortillas stay slightly crisp at the edges. If holding briefly, keep roasted squash warm in a low oven (90–100°C / 200–210°F) and cover with foil.