The phrase "heaping cup" means filling a cup with more than its usual or recommended amount, so that it is overflowing or piled up with whatever is in it. Full definition
Heat a skillet over medium heat and add 4 lightly chopped heaping cups of fresh baby spinach. (swankyrecipes.com)
Ingredients, Serves 2 2 frozen bananas 1 heaping cup frozen blueberries 1/2 inch -LSB-...] (vegan-magazine.com)
2 tablespoons extra virgin olive oil 2 cloves garlic, minced 1 medium onion, diced 1 medium red bell pepper, diced 1 sweet potato, peeled and chopped into bite sized chunks 2 tablespoons red curry paste 1 (14 ounce) can unsweetened coconut milk 4 cups vegetable broth 1 (13 ounce) package Ling Ling Asian Kitchen Potstickers 2 heaping cups fresh spinach Juice from one lime Fresh cilantro, for garnish (spoonfulofflavor.com)