Preheat broiler to high.
Place 3/4 cup cilantro, peppers, and tomatillos in a food processor; process 20 seconds. Add water, 1 tablespoon at a time, until sauce reaches desired consistency. Stir in juice.
Heat oil in a 10-inch cast-iron skillet over medium-high. Add zucchini, onion, and jalapeño; cook 6 minutes. Add spinach, stirring to wilt. Place zucchini mixture in a bowl. Wipe out pan.
Arrange tortilla chips in pan; top with tomatillo mixture, zucchini mixture, and cheese. Broil 2 minutes. Top with remaining 1/4 cup cilantro, pumpkin seeds, and hot sauce, if desired.
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