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Heat oil in a large pan over medium heat.
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Place 3 pounds of lean ground beef, in a large bowl.
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Add 2 eggs, and next 9 ingredients through pepper.
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Mix all together, but do not over mix.
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Form eight (8) ounce patties.
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In batches, brown patties on medium-high heat for about 2 - 3 minutes on each side.
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Pour 1 cup in bottom of slow cooker.
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Gently place hamburger patties in a single layer in bottom of slow cooker, overlapping as needed. Place sliced onions and another cup of enchilada sauce on top of patties.
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Cook on lowe for 5 hours.
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When ready to serve slice rolls in half.
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Heat oven to broil.
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Lightly butter cut sides of buns and toast for 2-3 minutes.
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Remove from oven and set aside top roll.
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Place shredded lettuce on bottom roll.
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Spread guacamole on cut side of top roll.
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Top lettuce with 1 patty, cooked onions and some sauce.
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Layer with pepper-jack cheese slices and place under broiler for another two minutes until cheese has melted.
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Spoon fresh salsa or pico de gallo on top of cheese.
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Add fresh avocado slices and top with roll.