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Preheat a large sauté pan over medium-high heat.
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Preheat oven to 375 degrees.
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Add olive oil to preheated sauté pan.
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Add chopped onion to pan and cook until translucent.
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Add garlic and ground beef to the cooking onions.
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Brown ground beef and drain any excess fat.
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Add the taco seasoning mix and diced tomatoes; stir ingredients to combine.
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Remove from heat and let cool slightly.
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Add about 4 ounces of the cheese to the beef mixture and stir to combine.
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Evenly stuff each pepper half with the beef mixture.
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Top each stuffed pepper with the rest of the cheese.
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Place stuffed peppers on a cookie sheet and bake in preheated oven for 15 to 20 minutes.
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Remove stuffed peppers from oven and evenly top them with the crushed tortilla chips.
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Place the peppers back in the oven for another 5 minutes or until tortilla chip topping is golden brown and filling mixture and cheese are bubbly.
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Remove stuffed peppers from oven and let cool slightly.
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Serve warm with salsa and sour cream.